Martin Claassen
Assistant Professor of Physics
University of Pennsylvania

Topological and Light-Induced Phases in Moiré Heterostructures

The remarkable tunability of twisted heterostructures of graphene or transition-metal dichalcogenides has opened new avenues for realizing unconventional correlated phases which rely on the formation of flat bands due to the moiré superlattice. This talk will describe routes towards realizing unconventional and topological states of matter in twisted transition-metal dichalcogenides that leverage the twist angle as a broader paradigm. I will discuss how quenching the kinetic energy scales can selectively tune the role of competing interactions, spin orbit coupling, dimensionality or even frustration, leading to diverse effects such as the emergence of moiré Kagome lattices in twisted bilayers of the group-IV TMD ZrS₂ as a platform to study topological and fractional Chern insulating phases, or hour-glass fermions and unconventional superconductivity in twisted SnS bilayers. I will then discuss prospects for using strong light fields to steer correlated phases in moiré heterostructures

Hosted by Ankit Disa

Pizza served starting at 12:10 p.m.
Please bring your own beverage

For those who cannot attend in person but would like to see the seminar, livestream only will be available via Zoom:
https://cornell.zoom.us/j/98722799978?pwd=OEdYdGpWYjVuSHh2Ry82NGw3T3ZZQT09
Webinar ID: 987 2279 9978
Passcode: 8235