Correlated Quantum States in a Large-Angle Twisted Bilayer WTe<sub>2</sub>
ORAL
Abstract
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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Presenters
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Yanyu Jia
- Princeton University