EE Student Information

Q-FARM Seminar: Quantum criticality in transition metal dichalcogenides

Topic: 
Quantum criticality in transition metal dichalcogenides
Wednesday, November 17, 2021 - 12:00pm
Venue: 
Physics & Astrophysics Building, Room 102/103
Speaker: 
Prof Abhay Pasupathy (Columbia)
Abstract / Description: 

I will discuss low temperature transport measurements on twisted bilayers of WSe2, where we see evidence for an electron-correlation driven insulating phase at half filling of the lowest moiré subband. I will then discuss how metal-insulator transitions can be driven in this system using gate voltages that tune doping and bandwidth. I will show evidence for the presence of a ring of quantum critical points in this system via the behavior of electron transport in the vicinity of the metal-insulator transitions. I will also describe generally the various types of disorder in moiré materials that we can image by microscopic measurements.

Bio: Abhay Pasupathy is a Professor of Physics at Columbia University and a Group Leader in the Condensed Matter Physics and Materials Science Division at Brookhaven National Laboratory. His group works on experiments to understand the quantum properties of quantum materials using scan probe microscopy techniques and electron transport.