Correlated Quantum States in a Large-Angle Twisted Bilayer WTe<sub>2</sub>

Recent experiments and theories have revealed compelling evidence that monolayer WTe₂, a quantum spin Hall insulator, is further an excitonic insulator at charge neutrality (CNP). Naturally exfoliated bilayer WTe₂ has also been reported as an insulator at CNP. Twisted bilayer WTe₂ (tWTe₂) at small angles (i.e., near 5 degree) develops novel 2D anisotropic behaviors that mimic the Luttinger liquid phase of a 1D system. The measured conductance of such small angle tWTe₂ follows a power law, i.e., an apparent insulating behavior when the temperature is reduced. In this talk, I will present quantum transport studies of tWTe₂ at a specific large twist angle, where the insulating behavior is fully suppressed even at CNP, in contrast to all the previously known monolayer and bilayer samples. I will discuss detailed transport characterization of this new phase at CNP in the tWTe₂ that arises by suppressing the excitonic insulating phase of the underlying monolayer.

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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

Abstract: W55.00006 : Correlated Quantum States in a Large-Angle Twisted Bilayer WTe2

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Abstract: W55.00006 : Correlated Quantum States in a Large-Angle Twisted Bilayer WTe₂