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SUMMARY:Michael Sentef (Max Planck Institute for the Structure and Dynamic
 s of Matter)
DTSTART:20210428T171500Z
DTEND:20210428T184500Z
DTSTAMP:20260423T021434Z
UID:VSFLRC/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/VSFLRC/11/">
 Cavity quantum materials</a>\nby Michael Sentef (Max Planck Institute for 
 the Structure and Dynamics of Matter) as part of VSF Long Range Colloquium
 \n\n\nAbstract\nRecent years have seen tremendous progress in utilizing ul
 trafast light-matter interaction to control the macroscopic properties of 
 quantum materials [1]. Many of the most intriguing effects are based on no
 nthermal pathways\, with the material (quantum many-body system) being dri
 ven away from its thermal equilibrium by strong laser pulses. While this h
 as deepened our understanding of quantum matter far from equilibrium and e
 nabled us to build bridges to other fields (quantum simulators\, Floquet s
 tates of matter\, (pre)thermalization\, …)\, there are a number of chall
 enges: (i) the need for strong lasers\, (ii) heating\, (iii) short lifetim
 e of light-induced states.\n\nThis has motivated an emergent community of 
 researchers to search for new directions that draw inspiration from the di
 scoveries in ultrafast materials science and combine them with expertise g
 leaned from quantum optics\, cavity QED\, polaritonic chemistry\, and nano
 plasmonics\, creating the new field of "cavity quantum materials“.\n\nIn
  this Colloquium\, I will provide a personal perspective on this new field
  and highlight a few of our recent works. Specifically\, I will discuss th
 e quantum-to-classical crossover of Floquet engineering in correlated syst
 ems and show how a many-photon classical coherent state can be replaced by
  a few-photon number state\, provided that one can reach the regime of suf
 ficiently strong light-matter coupling in a cavity [2]. I will then show h
 ow the quantum geometry of wavefunctions impacts their light-matter coupli
 ng\, and how we envision this to be a key ingredient for future light-matt
 er-based engineering of flat-band (Moiré) materials [3].\n\n[1] A. de la 
 Torre\, D. M. Kennes\, M. Claassen\, S. Gerber\, J. W. McIver\, M. A. Sent
 ef\, Nonthermal pathways to ultrafast control in quantum materials\, <a hr
 ef="https://arxiv.org/abs/2103.14888">arXiv:2103.14888</a>\n\n[2] M. A. Se
 ntef\, J. Li\, F. Künzel\, M. Eckstein\, Quantum to classical crossover o
 f Floquet engineering in correlated quantum systems\, Phys. Rev. Research 
 2\, 033033 (2020) [3] G. E. Topp\, C. J. Eckhardt\, D. M. Kennes\, M. A. S
 entef\, P. Törmä\, Light-matter coupling and quantum geometry in moiré 
 materials\, <a href="https://arxiv.org/abs/2103.04967">arXiv:2103.04967</a
 >\n
LOCATION:https://researchseminars.org/talk/VSFLRC/11/
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