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Institute for Condensed Matter Theory Seminar: "A tale of two insulators: TaSe2 and WTe2."

Event Type
Ceremony/Service
Sponsor
The Institute for Condensed Matter Theory
Date
Nov 16, 2020   12:00 pm  
Speaker
Patrick Lee, Massachusetts Institute of Technology
Views
103
Originating Calendar
Physics - The Anthony J Leggett Institute for Condensed Matter Theory Seminar

I shall discuss two monolayer transition metal dichalcogenides (TMD) that have unusual properties and are insulating for very different reasons.

TaSe2 is a cluster Mott insulator that is a promising candidate for a quantum spin liquid with spinon Fermi surface. I shall discuss the formation of a Kondo resonance between a magnetic impurity and the spinon Fermi surface and its consequence for STM tunneling. Monolayer WTe2 is a topological quantum spin Hall insulator. Recently sharp quantum oscillation peaks in the conductivity have been discovered in the insulator that resembles  the quantum oscillations in metals. I shall show that modeling the system as an excitonic insulator can provide an explanation.

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