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BEGIN:VEVENT
SUMMARY:Morten Kjaergaard (Postdoctoral Associate\, MIT Electrical Enginee
ring & Computer Science)
DTSTART;VALUE=DATE-TIME:20200630T150000Z
DTEND;VALUE=DATE-TIME:20200630T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/1
DESCRIPTION:Title: Programming a quantum computer with quantum instructions<
/a>\nby Morten Kjaergaard (Postdoctoral Associate\, MIT Electrical Enginee
ring & Computer Science) as part of Nano Explorations from MIT.nano\n\n\nA
bstract\nThe use of quantum bits to construct quantum computers opens the
door to dramatic computational speedups for certain problems. The maturity
of modern quantum computers has moved the field from being predominantly
a quantum device-focused research area to also include practical quantum-c
omputing application focused research.\n\nIn this talk\, Kjaergaard will d
iscuss a new experimental result on a foundational aspect of how to progra
m quantum computers. A central principle of classical computer programming
is the equivalence between data and instructions about what to do with th
at data. In quantum computers this equivalence is broken: Classical hardwa
re is used to generate the sequence of operations to be executed on the qu
antum data stored in the quantum computer. Our experiment shows for the fi
rst time how the instruction-data symmetry can be restored to quantum comp
uters. We use superconducting qubits as a platform to implement high-fidel
ity quantum operations enabling the so-called Density Matrix Exponentiatio
n algorithm\, to generate these quantum instructions. This algorithm provi
des large quantum speedups for a family of other quantum algorithms\, whic
h Kjaergaard will briefly discuss.\n\nhttps://mitnano.mit.edu/nano-explora
tions\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cheng Peng (PhD candidate\, MIT Electrical Engineering & Computer
Science)
DTSTART;VALUE=DATE-TIME:20200702T150000Z
DTEND;VALUE=DATE-TIME:20200702T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/2
DESCRIPTION:Title: Dynamically programmable surfaces for high-speed optical
modulation\nby Cheng Peng (PhD candidate\, MIT Electrical Engineering
& Computer Science) as part of Nano Explorations from MIT.nano\n\n\nAbstra
ct\nDynamically programmable surfaces for spatiotemporal control of light
are crucial to many optoelectronic technologies including high-speed optic
al communication\, display and projection\, autonomous driving\, optical i
nformation processing\, imaging\, and optical control in quantum computati
on. Currently available electro-optic spatial light modulators (SLMs) are
often bulky\, inefficient\, and have limited operation speeds. This talk d
escribes the development of a compact\, high-speed\, electro-optic SLM arc
hitecture based on a two-dimensional array of tunable microcavities. Optim
ized microcavity designs can enable high-speed\, high diffraction efficien
cy SLMs with standard-CMOS-compatible driving voltages. High-speed electro
-optic material options will also be discussed.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christopher Foy (PhD '20\, MIT Electrical Engineering & Computer S
cience)
DTSTART;VALUE=DATE-TIME:20200707T150000Z
DTEND;VALUE=DATE-TIME:20200707T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/3
DESCRIPTION:Title: Solid-state spin-integrated circuits for quantum sensing
and control\nby Christopher Foy (PhD '20\, MIT Electrical Engineering
& Computer Science) as part of Nano Explorations from MIT.nano\n\n\nAbstra
ct\nSpin systems are an increasingly important quantum-sensing platform. I
n particular\, atomic defect centers in diamond called nitrogen-vacancy (N
V) centers offer impressive room temperature imaging capabilities for both
magnetic fields and temperature. NV-based sensing platforms have found ut
ility in solid-state physics\, biological systems\, and vector magnetometr
y. These applications highlight the immense promise of NV quantum sensors.
Despite this promise\, the use of NV centers within commercial devices re
mains limited to date\, with many impediments to transitioning this platfo
rm from the laboratory.\n\nThis talk describes the development of solid-st
ate spin-integrated circuits (S3IC) for quantum sensing and control with t
he overarching goal of creating scalable NV platforms. We present two majo
r experiments that develop S3IC. These expand the application space of NV
centers and improve device functionality. The first application was to dev
elop an NV spin microscope capable of wide-field temperature and magnetic
field imaging to elucidate functional device behavior at the microscopic s
cale. The second experiment was integrating the essential components of an
NV spin microscope\, spin control and detection\, with integrated electro
nics. In this manner\, S3IC combines the exceptional sensitivity of NV cen
ters with the robustness and scalability of modern electronic chip-scale p
latforms.\n\nThis co-integration of spin systems into integrated electroni
cs shows a potential path for migrating previous proof-of-principal sensin
g demonstrations into affordable packages that demonstrate both much great
er system integration and custom electronic architectures. In short\, this
work demonstrates advances in NV-ensemble quantum sensing platforms and e
stablishes a foundation for future integration efforts\, perhaps inspiring
innovations in both application space and the development of new quantum
devices.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Milica Notaros (PhD candidate\, MIT Electrical Engineering & Compu
ter Science)
DTSTART;VALUE=DATE-TIME:20200709T150000Z
DTEND;VALUE=DATE-TIME:20200709T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/4
DESCRIPTION:Title: Liquid-crystal-based integrated optical phased arrays for
augmented reality\nby Milica Notaros (PhD candidate\, MIT Electrical
Engineering & Computer Science) as part of Nano Explorations from MIT.nano
\n\n\nAbstract\nAugmented reality (AR) head-mounted displays that project
information directly in the user’s field of view have many wide-reaching
applications in defense\, medicine\, engineering\, gaming\, etc. However\
, current commercial head-mounted displays are bulky\, heavy\, and indiscr
eet. Moreover\, these current displays are not capable of producing hologr
aphic images with full depth cues\; this lack of depth information results
in users experiencing eyestrain and headaches that limit long-term and wi
despread use of these displays (an effect known as the vergence-accommodat
ion conflict).\n\nIn this talk\, recent advances in the development of Vis
ible Integrated Photonics Enhanced Reality (VIPER)\, a novel integrated-ph
otonics-based holographic display\, will be reviewed. The VIPER display co
nsists of a single transparent chip with integrated liquid crystal that si
ts directly in front of the user’s eye and projects visible-light 3D hol
ograms that only the user can see. It presents a highly-discreet and fully
-holographic solution for the next generation of AR displays.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ali Khalatpour\, PhD (MIT Electrical Engineering & Computer Scienc
e)
DTSTART;VALUE=DATE-TIME:20200714T150000Z
DTEND;VALUE=DATE-TIME:20200714T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/5
DESCRIPTION:Title: New frontiers in THz quantum cascade lasers\nby Ali K
halatpour\, PhD (MIT Electrical Engineering & Computer Science) as part of
Nano Explorations from MIT.nano\n\n\nAbstract\nTerahertz (THz) frequencie
s remain among the least utilized in the electromagnetic spectrum\, largel
y due to the lack of powerful and compact sources. The invention of THz qu
antum cascade lasers (QCLs) was a major breakthrough to bridge the so-call
ed “THz gap” between semiconductor electronic and photonic sources. Ho
wever\, their demanding cooling requirement has confined the technology in
a laboratory environment. A portable and high-power THz laser system will
have a qualitative impact on applications in medical imaging\, communicat
ions\, quality control\, security\, and biochemistry.\n\nHere\, by adoptin
g a novel design strategy to achieve a clean 3-level system\, we have deve
loped THz QCLs (at ~4 THz) with a maximum operating temperature of 250 K\,
far exceeding the existing records. The new record is the major breakthro
ugh in the THz QCL field since its invention in 2001. The high operating t
emperature enables portable THz systems to perform real-time imaging with
a room-temperature THz camera\, as well as fast spectral measurements with
a room-temperature detector.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Albert Liu (PhD candidate\, MIT Chemical Engineering)
DTSTART;VALUE=DATE-TIME:20200721T150000Z
DTEND;VALUE=DATE-TIME:20200721T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/6
DESCRIPTION:Title: 2D-Material enabled colloidal electronics\nby Albert
Liu (PhD candidate\, MIT Chemical Engineering) as part of Nano Exploration
s from MIT.nano\n\n\nAbstract\nGraphene and other 2D materials possess des
irable mechanical and functional properties for incorporation into or onto
novel colloidal particles\, potentially granting them unique electronic a
nd optical functions. However\, this application has not yet been realized
because conventional top-down lithography scales poorly for the productio
n of colloidal solutions.\n\nLiu will describe an “autoperforation” te
chnique providing a means of spontaneous assembly for colloidal microparti
cles comprised of 2D molecular surfaces at scale. Such particles demonstra
te remarkable chemical\, mechanical and thermal stability. They can functi
on as aerosolizable memristor arrays capable of storing digital informatio
n\, as well as dispersible and recoverable probes for large-scale collecti
on of chemical information in water and soil.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Carlos Gonzalez Rosillo (Postdoctoral Associate\, MIT Materia
ls Science and Engineering)
DTSTART;VALUE=DATE-TIME:20200716T150000Z
DTEND;VALUE=DATE-TIME:20200716T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/7
DESCRIPTION:Title: Building neuromorphic computing units with battery materi
als\nby Juan Carlos Gonzalez Rosillo (Postdoctoral Associate\, MIT Mat
erials Science and Engineering) as part of Nano Explorations from MIT.nano
\n\n\nAbstract\nSpecialized hardware for neural networks requires material
s with tunable symmetry\, retention and speed at low power consumption. Ad
vances over the last years on understanding and implementing memristor tec
hnology had positioned them as a major candidate to overcome bottlenecks i
n current electronic-based transistors in terms of downscaling capabilitie
s and energy consumption. The vast majority of memristive devices are base
d on two types of ions: either oxygen vacancy migration\, in the so-called
Valence Change Memories (VCM)\, or a metal cation\, usually Ag+ and Cu2+\
, in the so-called Electrochemical Metallization Cells (ECM). Despite thei
r excellent performance\, their widespread implementation in today’s int
egrated circuits is delayed due to the need to address cycle-to-cycle and
device-to-device variabilities while circumventing electroforming and asym
metry\, which are inherent issues associated to the filamentary nature of
the switching mechanism.\n\nRecently\, Li-ion is emerging as an alternativ
e\, given the higher diffusivity of Li+ when compared to oxygen\, and the
ability of Li-oxides solid state conductors to accumulate and deplete lith
ium at the interfaces and bulk. We have proposed lithium titanates\, origi
nally developed as Li-ion battery anode materials\, as promising candidate
s for memristive-based neuromorphic computing hardware.\n\nIn this seminar
\, Gonzalez Rosillo will discuss the non-volatile\, non-filamentary bipola
r resistive switching characteristics of lithium titanates compounds\, Li4
+3xTi5O12\, as a function of the lithiation degree. We have employed a rec
ently proposed strategy to overcome lithium loss during thin film depositi
on and finely control the final lithiation degree of the films to create s
toichiometrically lithiated Li4Ti5O12 spinel phase and a highly lithiated
Li7Ti5O12 rock- salt phase memristive devices. By using ex- and in-operand
o spectroscopy to monitor the Lithium filling and emptying of structural p
ositions during electrochemical measurements\, we investigate the controll
ed formation of a metallic phase (Li7Ti5O12) percolating through an insula
ting medium (Li4Ti5O12) with no volume changes under voltage bias\, thereb
y controlling the spatially averaged conductivity of the film device.\n\nW
e present a theoretical model to explain the observed hysteretic switching
behavior based on electrochemical nonequilibrium thermodynamics\, in whic
h the metal-insulator transition results from electrically driven phase se
paration of Li4Ti5O12 and Li7Ti5O12. Permittivity enhancement drives lithi
um ions to regions of high electric field intensity\, which become metalli
c filaments above a critical applied bias\, and the ions relax back to the
ir low-conductivity initial state at lower voltages.\n\nOne of the most st
riking outcomes is that the metal-insulator transition of llithium titanat
e can be uniquely modulated for neuromorphic computing purposes\, such as
control of the neural pulse train symmetry in conductance and the resistan
ce on-to-off ratio\, simply by adjusting the lithium stoichiometry and pha
se pattern of the films. We report ability of highly lithiated phase of Li
7Ti5O12 for Deep Neural Network applications\, given the large retentions
and symmetry\, and opportunity for the low lithiated phase of Li4Ti5O12 to
wards Spiking Neural Network applications\, due to the shorter retention a
nd large resistance changes. Our findings pave the way for lithium oxides
to enable thin-film memristive devices with adjustable symmetry and retent
ion.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diana Wofk (MEng '20\, MIT Electrical Engineering & Computer Scien
ce)
DTSTART;VALUE=DATE-TIME:20200723T150000Z
DTEND;VALUE=DATE-TIME:20200723T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/8
DESCRIPTION:Title: Fast and energy-efficient monocular depth estimation on e
mbedded systems\nby Diana Wofk (MEng '20\, MIT Electrical Engineering
& Computer Science) as part of Nano Explorations from MIT.nano\n\n\nAbstra
ct\nDepth sensing is a critical function for many robotic tasks such as lo
calization\, mapping and obstacle detection. There has been a significant
and growing interest in performing depth estimation from monocular RGB cam
era images\, due to the relatively low cost\, size\, weight and power of c
ameras. However\, state-of-the-art depth estimation algorithms are based o
n fairly large deep neural networks\, which have high computational comple
xity and energy consumption. This poses a significant challenge when perfo
rming real-time depth estimation on an embedded system\, for instance\, a
mobile phone or a platform mounted on a Micro Aerial Vehicle (MAV).\n\nOur
work addresses this problem of fast and energy-efficient depth estimation
on embedded platforms. Our proposed network\, FastDepth\, runs at 178 fps
on the Jetson TX2 embedded GPU\, with active power consumption of 8.8 W.
We seek to further improve energy efficiency by deploying onto a low-power
embedded FPGA. Using an algorithm-hardware co-design approach\, we develo
p a dataflow design and an accelerator architecture that minimizes off-chi
p memory accesses and offers dedicated support for depthwise separable con
volutional layers. This talk will give an overview of our approach and the
strategies we take in accelerating learning-based depth estimation on emb
edded systems.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Junyi Zhu (MIT Electrical Engineering & Computer Science (EECS))
DTSTART;VALUE=DATE-TIME:20200730T150000Z
DTEND;VALUE=DATE-TIME:20200730T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/9
DESCRIPTION:Title: Integrating object form and electronic function in rapid
prototyping and personal fabrication\nby Junyi Zhu (MIT Electrical Eng
ineering & Computer Science (EECS)) as part of Nano Explorations from MIT.
nano\n\n\nAbstract\nRapid prototyping is a key technique that enables user
s to quickly realize their digital designs\, therefore it has been widely
used in early-stage prototyping and small-scale customized fabrication. A
long-term vision in Human-Computer Interaction is to create interactive ob
jects for which all functions are directly integrated with the form and fa
bricated in one-go. So far\, rapid prototyping has mainly focused on fabri
cating passive objects for which the form of an object can be freely desig
ned\, but recently we have also moved towards digital specification and fa
brication of object functions for interactive design. These advances offer
the promise that eventually in rapid function prototyping\, the interacti
ve object form and function would be under the same design consideration\,
therefore the object form could follow its designated function\, and func
tion adapt upon its physical form\, and vice versa.\n\nIn this talk\, Zhu
will present two projects in this domain: MorphSensor and CurveBoards. Mor
phSensor is a 3D electronics design tool for designing electronic function
in the context of a prototype’s three-dimensional shape. MorphSensor un
ifies electronic and physical object design in one 3D workspace as one com
plete workflow\, which leads to better form and function integration. Curv
eBoards are 3D breadboards directly integrated into the surface of physica
l prototypes. CurveBoards better preserve the object’s look and feel whi
le maintaining high circuit fluidity\, which enables designers to prototyp
e and iterate function in the context of form.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Walsh\, PhD (MIT Electrical Engineering & Computer Science
(EECS))
DTSTART;VALUE=DATE-TIME:20200728T150000Z
DTEND;VALUE=DATE-TIME:20200728T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/10
DESCRIPTION:Title: Solid-state platform for Boston quantum network\nby
Michael Walsh\, PhD (MIT Electrical Engineering & Computer Science (EECS))
as part of Nano Explorations from MIT.nano\n\n\nAbstract\nQuantum emitter
s\, such as color centers (e.g.\, nitrogen-vacancy color centers in diamon
d)\, have a wide range of applications in quantum information processing\,
bio-imaging\, and quantum-sensing. Such quantum emitters are typically ad
dressed optically and store their quantum state as an electron spin that c
an subsequently be read out optically. For this process to work effectivel
y\, an efficient light-matter interaction must be achieved\, which is dif
ficult given the small interaction cross-section of an atomic memory with
the optical field.\n\nIn this talk\, Walsh will address two problems that
relate to the engineering of a device that demonstrates a quantum advantag
e. The first problem centers on the fact that most quantum emitters are ra
ndomly positioned throughout their host lattice making it difficult to lit
hographically pattern structures intended to increase the light-matter int
eraction. While there is a non-zero chance that a small number of randomly
aligned structures will coincide with randomly positioned emitters\, when
efforts to scale such a system are made the yield drops exponentially. Th
e second problem has to do with scaling. As systems scale up to larger set
s of interacting qubits\, it becomes increasingly necessary to produce qua
ntum emitters with narrow optical transitions and long spin coherence time
s.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ting-An Lin (PhD Candidate\, Electrical Engineering & Computer Sci
ence)
DTSTART;VALUE=DATE-TIME:20201027T150000Z
DTEND;VALUE=DATE-TIME:20201027T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/11
DESCRIPTION:Title: Strategies for high-performance solid-state photon upcon
version based on triplet exciton annihilation\nby Ting-An Lin (PhD Can
didate\, Electrical Engineering & Computer Science) as part of Nano Explor
ations from MIT.nano\n\n\nAbstract\nPhoton upconversion\, a non-linear opt
ical process to convert low-energy photons into higher energies\, has vari
ous applications such as photovoltaics\, infrared sensing\, and bio-imagin
g. Particularly\, upconversion based on triplet exciton annihilation is on
e of the most promising approaches to achieve high efficiency at low excit
ation intensity for practical applications. However\, the reported perform
ance in solid-state is limited due to energy back transfer\, material aggr
egation\, and weak optical absorption\, which complicates the integration
with solid-state applications.\n\nIn this talk\, Lin will discuss the rese
arch group's proposed strategies to improve the performance in solid-state
. In a green-to-blue upconverter consisting of a bilayer of an absorbing a
nd an upconverting material\, they reduced energy back transfer by inserti
ng a blocking layer in between and mitigate aggregation by doping the abso
rber into a host material. The upconversion efficiency had a 7-fold enhanc
ement with the excitation intensity reduced by 9 times. To improve optical
absorption\, they investigated an infrared-to-visible upconverter and int
egrate the up-converting layers into a Fabry-Pérot microcavity. At the re
sonant wavelength\, absorption increases 74-fold and the threshold excitat
ion intensity is reduced by two orders of magnitude to a sub-solar flux. T
heir work demonstrates the importance of device structure engineering to i
mprove the performance of solid-state photon upconversion\, and offers a p
ath toward practical applications.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jinchi Han (PhD Candidate\, Electrical Engineering & Computer Scie
nce)
DTSTART;VALUE=DATE-TIME:20201110T160000Z
DTEND;VALUE=DATE-TIME:20201110T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/12
DESCRIPTION:Title: Nanoscale mechanical switches with squeezable molecular
springs—Squitches\nby Jinchi Han (PhD Candidate\, Electrical Enginee
ring & Computer Science) as part of Nano Explorations from MIT.nano\n\n\nA
bstract\nNanoelectromechanical (NEM) switches are a candidate technology f
or beyond-CMOS energy-efficient computing. They can exhibit near-zero stat
ic leakage\, large on-off current ratio\, steep subthreshold slope\, and h
igh robustness in harsh environments. NEMs are\, however\, challenged by s
ignificant van der Waals interaction at the nanoscale between their contac
ting electrodes\, which can result in compromised performance in terms of
turn-on voltage and switching speed\, critical characteristics for good de
vice reliability.\n\nA way to address the NEM electrode stiction challenge
will be presented in this talk\, which will explore an approach of fabric
ating an electrostatically-controlled nanogap using self-assembled molecul
ar spacer layer sandwiched between atomically-smooth conductive nanostruct
ures. The molecular layer acts like a spring between the two sandwiching e
lectrodes\, compressing as needed under the electrostatically-applied “s
queeze” to modify the tunneling current. Hence\, we referred to this NEM
structure as the squeezable-switch or the “squitch”. The operating sq
uitch structures show a sharp electrical switching behavior with several-o
rders-of-magnitude on-off current ratio\, as the tunneling gap is modified
by only ~1 nm in distance. This unique working principle allows squitches
to simultaneously achieve low turn-on voltages and low time delays\, whil
e surmounting the challenge of NEM device electrode stiction.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Rodan-Legrain (PhD Candidate\, Physics)
DTSTART;VALUE=DATE-TIME:20201124T160000Z
DTEND;VALUE=DATE-TIME:20201124T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/13
DESCRIPTION:Title: Highly tunable junctions in magic angle twisted bilayer
graphene tunneling devices\nby Daniel Rodan-Legrain (PhD Candidate\, P
hysics) as part of Nano Explorations from MIT.nano\n\n\nAbstract\nThe rece
nt observation of superconductivity and correlated insulating states in
‘magic-angle’ twisted bilayer graphene (MATBG) featuring nearly-flat b
ands at twist angles close to 1.1 degrees presents a highly tunable two-di
mensional material platform capable of behaving as a metal\, an insulator\
, or a superconductor. Local electrostatic control over these phases may e
nable the creation of versatile quantum devices that were previously not a
chievable in other single material platforms.\n\nIn this talk\, Rodan-Legr
ain will introduce MATBG as a new arena to investigate strongly correlated
physics. He will then show how they can exploit the electrical tunability
of MATBG to engineer Josephson junctions and tunneling transistors all wi
thin one material\, defined solely by electrostatic gates. The research gr
oup's multi-gated device geometry offers complete control over the Josephs
on junction\, with the ability to independently tune the weak link\, barri
ers\, and tunneling electrodes. Utilizing the intrinsic bandgaps of MATBG\
, they also demonstrate monolithic edge tunneling spectroscopy within the
same MATBG devices and measure the energy spectrum of MATBG in the superco
nducting phase.\n\nFurthermore\, by inducing a double barrier geometry\, t
he devices can be operated as a single-electron transistor\, exhibiting Co
ulomb blockade. These MATBG tunneling devices\, with versatile functionali
ty encompassed within a single material\, may find applications in graphen
e-based tunable superconducting qubits\, on-chip superconducting circuits\
, and electromagnetic sensing in next-generation quantum nanoelectronics.\
n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jie Li (Postdoctoral associate\, Chemistry)
DTSTART;VALUE=DATE-TIME:20201208T160000Z
DTEND;VALUE=DATE-TIME:20201208T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/14
DESCRIPTION:Title: Fluorescent Janus droplet and its application in biosens
ing of Listeria Monocytogenes\nby Jie Li (Postdoctoral associate\, Che
mistry) as part of Nano Explorations from MIT.nano\n\n\nAbstract\nDynamic
complex droplets afford versatile platforms for biosensing\, and the biose
nsing methods based on droplets enable a combination of advantages includi
ng speed\, cost-effectiveness\, and portability. In this talk\, Li will di
scuss a sensing method based on the agglutination of Janus emulsions for L
isteria Monocytogenes\, a gram-positive bacterium responsible for a potent
ially lethal foodborne bacterial illness.\n\nThe bio-recognition interface
created between the Janus emulsions comprises an equal volume of hydrocar
bon and fluorocarbon oils in Janus morphology. This is done by attaching a
ntibodies to a functional surfactant polymer with a tetrazine/trans-cycloo
ctene (TCO) click reaction. The Listeria antibodies will be on the surface
of the hydrocarbon hemisphere\, since the surfactant will stay at the int
erface of hydrocarbon and water phase. Agglutinations of Janus droplets ar
e formed when Listeria is added because of the strong binding between List
eria and the Listeria antibody located at the hydrocarbon surface of the e
mulsions.\n\nBy incorporating one emissive dye in the fluorocarbon phase a
nd a blocking dye in the hydrocarbon phase of Janus droplets\, Li can cond
uct a two-dye assay\, which enables the rapid detection of trace Listeria
in less than two hours via an emissive signal produced in response to List
eria binding. To clarify\, the Janus structure is tilted from its equilibr
ium position as a result of the formation of agglutinations\, and produces
emission that would ordinarily be obscured by a blocking dye. Overall\, t
his method not only provides rapid and inexpensive Listeria detection with
high sensitivity\, but also can be paired with antibodies or related reco
gnition elements to create a new class of biosensors.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abinash Kumar (PhD candidate\, Materials Science & Engineering)
DTSTART;VALUE=DATE-TIME:20201222T160000Z
DTEND;VALUE=DATE-TIME:20201222T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/15
DESCRIPTION:Title: Decoding complexities in relaxor ferroelectrics using el
ectron microscopy\nby Abinash Kumar (PhD candidate\, Materials Science
& Engineering) as part of Nano Explorations from MIT.nano\n\n\nAbstract\n
Relaxor ferroelectrics show slim hysteresis loops\, low remanent polarizat
ion\, high saturation polarization\, and exceptional electromechanical cou
pling\, finding applications in ultrasound imaging and energy storage devi
ces. Developing a structure-property relationship in relaxors has been a s
eemingly intractable problem due to the presence of nanoscale chemical and
structural heterogeneities.\n\nIn this presentation\, Kumar will discuss
how researchers employed aberration-corrected scanning transmission electr
on microscopy (STEM) to quantify the various contributions of nanoscale he
terogeneity to relaxor ferroelectric properties in PMN-PT system. Specific
ally\, they found three main contributions—chemical ordering\, oxygen oc
tahedral tilting\, and oxygen octahedral distortion—that are difficult t
o otherwise differentiate. Through STEM\, the elusive connection between c
hemical and structural heterogeneity and local polarization variation is r
evealed. Further\, the effects of strain and thickness on PMN-PT thin film
s will be discussed. Through these measurements\, design principles for ne
xt generation relaxor material are elucidated.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:James McRae (MIT Graduate student\, Mechanical Engineering (MechE)
\; Lincoln Laboratory\, Advanced Materials & Microsystems)
DTSTART;VALUE=DATE-TIME:20210216T160000Z
DTEND;VALUE=DATE-TIME:20210216T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/16
DESCRIPTION:Title: Silicate-based composite as heterogeneous integration pa
ckaging material for extreme environments\nby James McRae (MIT Graduat
e student\, Mechanical Engineering (MechE)\; Lincoln Laboratory\, Advanced
Materials & Microsystems) as part of Nano Explorations from MIT.nano\n\n\
nAbstract\nElectronic microsystems are foundational to today’s computati
onal\, sensing\, communication\, and information processing capabilities\,
therefore impacting industries such as microelectronics\, aerospace\, hea
lthcare\, and many more. Cell phones are an example of what is possible wh
en a variety of systems can be tightly integrated into a highly portable a
nd capable system. However\, as we aim to improve our ability to interact
and operate (e.g.\, sense\, communicate\, record\, compute\, move\, etc.)
in extreme environments (such as outer space or the human body)\, new meth
ods and materials must be developed to manufacture such integrated systems
that will endure post-processing\, environmental\, and operational challe
nges.\n\nTypical organic-based packaging materials (e.g.\, polymer adhesiv
es\, coatings\, and molding materials) often suffer from outgassing and le
aching that can lead to system contamination\, as well as coefficient of t
hermal expansion (CTE) mismatches that can lead to warpage and breakage wi
th fluctuations in system temperature during operation. This work demonstr
ates an alternative\, by using a silicate-based inorganic glass composite
as an electronics packaging material for stability in extreme environments
. Combining liquid alkali sodium silicate (water glass) and nanoparticle f
illers\, composites can be synthesized and cured at low temperatures into
chemically\, mechanically\, and thermally (up to 400 oC) stable structures
using high throughput processing methods such as spin and spray coating.
Further\, this material can be processed into thick layers (10s to 100s of
microns)\, fill high aspect ratio gaps (13:1)\, withstand common microfab
rication processes\, and have its CTE tailored to match various substrates
.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Noel Wan (PhD student\, Electrical Engineering & Computer Science
(EECS))
DTSTART;VALUE=DATE-TIME:20210202T160000Z
DTEND;VALUE=DATE-TIME:20210202T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/17
DESCRIPTION:Title: Large-scale integration of artificial atoms with photoni
c circuits\nby Noel Wan (PhD student\, Electrical Engineering & Comput
er Science (EECS)) as part of Nano Explorations from MIT.nano\n\n\nAbstrac
t\nThe construction of large\, controllable quantum systems is a formidabl
e task in quantum science and technology. In the context of quantum networ
ks\, single emitters in diamond have emerged as leading quantum bits that
combine long coherence times with efficient optical interfaces. Despite th
eir potential manufacturability\, such solid-state qubits have been limite
d to small-scale quantum network demonstrations due to their low system ef
ficiencies\, deteriorated properties in devices\, and low yields.\n\nTo ad
dress these challenges\, we report the development of a nanophotonic platf
orm in diamond for the efficient control and routing of photons. In partic
ular\, we describe the fabrication and coupling of qubits to single-mode w
aveguides and photonic crystal resonators. We then demonstrate the large-s
cale heterogeneous integration of diamond waveguide-coupled qubits with ph
otonic circuits in another material system. This hybrid quantum chip archi
tecture enables the combination of coherent qubits in diamond with low-los
s active photonics in aluminum nitride or silicon nitride. This modularity
also circumvents the low device yields associated with monolithic chips\,
enabling here a 128-channel\, qubit-integrated photonic chip with frequen
cy tunability and high optical coherence. As an outlook\, we discuss ongoi
ng efforts that combine the advances towards the construction of a quantum
repeater microchip.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jules Stuart (Research Assistant\, MIT Lincoln Laboratory\; Physic
s PhD candidate\, 2021\, MIT)
DTSTART;VALUE=DATE-TIME:20210316T150000Z
DTEND;VALUE=DATE-TIME:20210316T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/18
DESCRIPTION:Title: Integrated photonics and electronics for chip-scale quan
tum control of trapped ions\nby Jules Stuart (Research Assistant\, MIT
Lincoln Laboratory\; Physics PhD candidate\, 2021\, MIT) as part of Nano
Explorations from MIT.nano\n\n\nAbstract\nTrapped atomic ions are promisin
g candidates for quantum information processing and quantum sensing. Curre
nt state-of-the-art trapped-ion systems require many lasers and electronic
s to achieve precise timing and control over quantum states. Usually\, el
ectronic signals are sent into vacuum chambers via wire feedthroughs\, and
laser light is focused down to a trapped ion’s location with external l
enses mounted outside of viewports on the chamber. These requirements lead
to dense and complex setups that may be prone to drift and limit the amou
nt of control that can be achieved.\n\nIn this presentation\, Stuart will
report on recent progress toward integrating control technology into the s
ubstrate of the ion trap itself. By using a planar trap design\, which is
compatible with lithographic fabrication\, other well-developed processes
may be implemented in order to enhance the function of the ion trap. In on
e experiment\, researchers demonstrate an ion trap with integrated\, CMOS-
based high-voltage sources\, which can be used to control the motional fre
quency and position of a trapped ion. In another demonstration\, they use
photonic waveguides and diffractive grating couplers to route light around
a chip and focus it onto ions trapped above the surface.\n\nIntegrating c
ontrols into ion traps has the potential to increase the density of indepe
ndently controllable ions on a chip in next-generation systems\, but there
are also many immediate practical benefits. Reducing the number of requir
ed feedthroughs allows chambers to be made more compact\, which may be use
ful for ion-based clocks or sensors. The researchers also show that integr
ated-photonic platforms help to reduce vibration-induced noise seen when u
sing external optics\, which may enable portable systems based on trapped-
ion quantum information processing.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ENS Maximilian Ulbert (MIT Lincoln Laboratory\, MIT)
DTSTART;VALUE=DATE-TIME:20210330T150000Z
DTEND;VALUE=DATE-TIME:20210330T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/19
DESCRIPTION:Title: Practical fiber batteries for wearables based on thermal
ly drawn Zn-MnO2\nby ENS Maximilian Ulbert (MIT Lincoln Laboratory\, M
IT) as part of Nano Explorations from MIT.nano\n\n\nAbstract\nThe concept
of the Internet-of-Things has inspired growth in the field of wearable te
chnology\, from aesthetically-pleasing color changing fabrics to practical
heart rate monitors\, all interwoven into any variety of clothes (ie. shi
rts\, pants\, hats\, blankets\, bags\, etc.). For a continuously operating
wearable system\, an energy storage vessel is needed: a battery.\n\nSpeci
fically\, interwoven or fabric-based systems demand that the battery be in
tegrated in the fabric or fibers themselves. The primary challenge for suc
h an integrated battery is rendering the active components of a battery (c
athode\, anode\, and electrolyte) into a fiber. Existing challenges for fi
ber batteries include high materials costs\, low power output\, and compli
cated assembly approaches. Further\, for the practical implementation of a
fiber battery into wearable systems that make direct skin contact and are
exposed to the ambient environment\, battery safety is of key importance.
\n\nThis work seeks to address both assembly and safety issues by developi
ng an easily manufacturable fiber battery by means of a thermal draw tower
using a safer Zn-ion chemistry (Zn/MnO2) with a gel polymer electrolyte (
GPE). As the GPE offers a high ionic conductivity\, mechanical properties
compatible with thermal draw towers and provides a physical separator betw
een cathode and anode\, the performance of lab scale prototypes and a draw
n-fiber prototype will be discussed.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Erik Eisenach (Research Assistant Lincoln Laboratory\; Electrical
Engineering & Computer Science PhD candidate\, 2020)
DTSTART;VALUE=DATE-TIME:20210427T150000Z
DTEND;VALUE=DATE-TIME:20210427T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/20
DESCRIPTION:Title: Cavity—enhanced microwave readout of a diamond sensor<
/a>\nby Erik Eisenach (Research Assistant Lincoln Laboratory\; Electrical
Engineering & Computer Science PhD candidate\, 2020) as part of Nano Explo
rations from MIT.nano\n\n\nAbstract\nOvercoming poor readout is an increas
ingly urgent challenge for devices based on solid-state spin defects\, par
ticularly given their rapid adoption in quantum sensing\, quantum informat
ion\, and tests of fundamental physics. In spite of experimental progress
in very specific systems\, solid-state spin sensors lack a universal\, hig
h-fidelity readout technique.\n\nIn this talk\, Eisenach will discuss how
he and fellow researchers leverage strong coupling between an ensemble of
solid-state spins and a dielectric microwave cavity for high-fidelity\, ro
om-temperature readout of nitrogen-vacancy centers. Using this strong coll
ective interaction\, they probe the spin ensemble’s microwave transition
directly\, overcoming the optical photon shot noise limitations of conven
tional fluorescence readout. Furthermore\, they apply this technique to ma
gnetometry\, and show magnetic sensitivity approaching the Johnson–Nyqui
st noise limit of the system.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ahmad Zubair (Postdoctoral Associate\, Microsystems Technology Lab
oratories (MTL)\, MIT)
DTSTART;VALUE=DATE-TIME:20210302T160000Z
DTEND;VALUE=DATE-TIME:20210302T164500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/21
DESCRIPTION:Title: Challenges & opportunities for the next generation of po
wer electronic devices\nby Ahmad Zubair (Postdoctoral Associate\, Micr
osystems Technology Laboratories (MTL)\, MIT) as part of Nano Explorations
from MIT.nano\n\n\nAbstract\nBy 2030\, about 80% of all United States ele
ctricity is expected to flow through power electronics and the market size
is expected to exceed 1000 TW-unit per year from the current market size
of 2 TW unit. This exponential growth will require power electronics devic
es and circuits with much higher efficiency and smaller form-factor than t
oday’s silicon-based systems. III-Nitride semiconductors and other ultra
-wide bandgap materials are ideal material systems for energy-efficient ne
w generation of power electronics\, thanks to the combination of excellent
transport properties and the high critical electric field enabled by thei
r wide bandgap.\n\nVertical FinFETs are promising high voltage switches fo
r the next generation of high-frequency power electronics applications. Th
anks to a nanostructured vertical fin channel\, the device offers excellen
t electrostatic control\, eliminating the need for epitaxial regrowth or p
-type doping unlike other vertical power transistors. Vertical GaN FinFETs
with 1200 V breakdown voltage (BV) and 5A current rating have been demons
trated recently on free-standing GaN substrate. The high current density o
f these devices\, in combination with minimum parasitics\, allow these dev
ices to achieve beyond-state-of-the-art switching performance.\n\nThis tal
k will discuss the recent progress of GaN vertical power FinFETs on native
GaN substrate highlighting the device and materials level opportunities a
s well as challenges to push performance limits of these devices. Despite
this promising performance\, the commercialization of these devices has b
een limited by the high cost ($50-$100/cm2) and small diameter (2-4 inch)
of free-standing GaN substrates. The use of Si could potentially reduce th
e substrate cost by 1000x and enable heterogeneous integration. This talk
will also discuss the recent efforts on the heterogeneous integration of G
aN vertical power FinFETs on Si platform.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ty Christoff-Tempesta (PhD Candidate Materials Science & Engineeri
ng)
DTSTART;VALUE=DATE-TIME:20210413T150000Z
DTEND;VALUE=DATE-TIME:20210413T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/22
DESCRIPTION:Title: Small molecule assemblies with a bulletproof design: the
aramid amphiphile\nby Ty Christoff-Tempesta (PhD Candidate Materials
Science & Engineering) as part of Nano Explorations from MIT.nano\n\n\nAbs
tract\nSmall molecule self-assembly offers a powerful bottom-up approach t
o producing nanostructures with high surface areas\, tunable surfaces\, an
d defined internal order. Historically\, the dynamic nature of these syste
ms has limited their use to specific cases\, especially biomedical applica
tions\, in solvated environments.\n\nIn the talk\, Christoff-Tempesta will
present a self-assembling small molecule platform\, the aramid amphiphile
(AA)\, that overcomes these dynamic limitations. AAs incorporate a Kevlar
-inspired domain within each molecule to produce strong interactions betwe
en molecules. Christoff-Tempesta and fellow researchers have observed AAs
spontaneously form nanoribbons when added to water with aspect ratios exce
eding 4000:1. Robust internal interactions suppress the ability of AAs to
move between assemblies and result in nanoribbons with mechanical properti
es rivaling silk. \n\nThe team harnesses this stability to – for the fir
st time – extend small molecule assemblies to the solid-state\, forming
macroscopic threads that are easily handled and support 200 times their we
ight when dried. The AA platform offers a novel route to extend small mole
cule self-assembly to aligned macroscopic materials and beyond solvated en
vironments.\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bharath Kannan (PhD Candidate\, Electrical Engineering & Computer
Science\, MIT)
DTSTART;VALUE=DATE-TIME:20210511T150000Z
DTEND;VALUE=DATE-TIME:20210511T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/23
DESCRIPTION:by Bharath Kannan (PhD Candidate\, Electrical Engineering & Co
mputer Science\, MIT) as part of Nano Explorations from MIT.nano\n\nAbstra
ct: TBA\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jawaher Almutlaq (Postdoctoral Fellow\, Research Laboratory of Ele
ctronics)
DTSTART;VALUE=DATE-TIME:20210525T150000Z
DTEND;VALUE=DATE-TIME:20210525T154500Z
DTSTAMP;VALUE=DATE-TIME:20240329T065454Z
UID:mitnano-nanoexplorations/24
DESCRIPTION:by Jawaher Almutlaq (Postdoctoral Fellow\, Research Laboratory
of Electronics) as part of Nano Explorations from MIT.nano\n\nAbstract: T
BA\n
LOCATION:https://researchseminars.org/talk/mitnano-nanoexplorations/24/
END:VEVENT
END:VCALENDAR