Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session W55: Topological and Correlated States in Twisted Transition Metal Dichalcogenides
3:00 PM–6:00 PM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Adler
Sponsoring
Unit:
DCMP
Chair: Luis Ruiz Pestana, University of Miami
Abstract: W55.00012 : Spontaneous fractional Chern insulators in transition metal dichalcogenide moiré superlattices
5:12 PM–5:24 PM
Presenter:
Heqiu Li
(University of Michigan)
Authors:
Heqiu Li
(University of Michigan)
Umesh Kumar
(Los Alamos National Laboratory)
Kai Sun
(University of Michigan)
Shizeng Lin
(Los Alamos National Laboratory)
strongly correlated electronic states. In this work, we study transition metal dichalcogenides (TMD) Moiré
superlattices with time-reversal symmetry and nontrivial spin/valley-Chern numbers. Utilizing realistic material
parameters and the method of exact diagonalization, we find that at a certain twisting angle and fractional
filling, gapped fractional topological states, i.e., fractional Chern insulators, are naturally stabilized by simply
introducing the Coulomb repulsion. In contrast to fractional quantum Hall systems, where the time-reversal
symmetry has to be broken explicitly, these fractional states break the time-reversal symmetry spontaneously.
We show that the Chern number contrasting in the opposite valleys imposes a strong constraint on the nature of
fractional Chern insulator and the associated low-energy excitations.
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