BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Jyoti Katoch (Carnegie Mellon University) DTSTART:20201002T170000Z DTEND:20201002T180000Z DTSTAMP:20260423T024556Z UID:CMU-TP/9 DESCRIPTION:Title: P robing two-dimensional materials using focused angle-resolved photoemissio n spectroscopy\nby Jyoti Katoch (Carnegie Mellon University) as part o f Carnegie Mellon theoretical physics\n\n\nAbstract\nTwo-dimensional (2D) materials offer the freedom to create novel condensed matter systems\, wit h unique properties\, by mechanically assembling different (or same) 2D ma terials layer-by-layer to form atomically sharp vertical or lateral hetero structures. The van der Waals (vdW) heterostructures with small lattice mi smatch and a relatively small twist angle between the constituent layers\, have shown to exhibit coexisting complex phases of matter including Mott insulating state\, superconductivity\, bound quasiparticles\, and topologi cal states. In addition\, the extreme surface sensitivity of two-dimension al (2D) materials provides an unprecedented opportunity to engineer the ph ysical properties of these materials using external perturbations. In this talk\, I will discuss the utilization of angle-resolved photoemission spe ctroscopy (ARPES) with high spatial resolution to investigate the electron ic band structure of 2D heterostructures and their devices. This can shed light on the intricate relationship between controlled external perturbati ons\, substrate\, and electronic properties of 2D materials [1\, 2]. In pa rticular\, I will discuss our in-operando nanoARPES results that exhibit h ighly tunable many-body effects in graphene devices [3] and tunable van Ho ve singularities in twisted bilayer graphene [4]. \n\nReferences:\n[1] Kat och et. al.\, Nature Physics 14\, 355-359 (2018).\n[2] Ulstrup\, et. al.\, Science Advances\, Vol. 6\, no. 14\, eaay6104\, (2020).\n[3] Muzzio\, et. al.\, Physical review B Rapid Communications 101\, 201409(R) (2020).\n[4] Jones\, et. al.\, Adv. Mater. 2020\, 32\, 2001656.\n LOCATION:https://researchseminars.org/talk/CMU-TP/9/ END:VEVENT END:VCALENDAR