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arXiv · 2405.09616

Possible Sliding Regimes in Twisted Bilayer WTe$_2$

Yi-Ming Wu·Chaitanya Murthy·Steven A. Kivelson
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Abstract

Inspired by the observation of increasingly one-dimensional (1D) behavior with decreasing temperature in small-angle twisted bilayers of WTe$_2$ (tWTe$_2$), we theoretically explore the exotic sliding regimes that could be realized in tWTe$_2$. At zero displacement field, while hole-doped tWTe$_2$ can be thought of as an array of weakly coupled conventional two-flavor 1D electron gases (1DEGs), the electron-doped regime is equivalent to coupled four-flavor 1DEGs , due to the presence of an additional "valley'' degree of freedom. In the decoupled limit, the electron-doped system can thus realize phases with a range of interesting ordering tendencies, including $4k_F$ charge-density-wave and charge-$4e$ superconductivity. Dimensional crossovers and cross-wire transport due to inter-wire couplings of various kinds are also discussed. We find that a sliding Luther-Emery liquid with small inter-wire couplings is probably most consistent with current experiments on hole-doped tWTe$_2$.

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Yi-Ming Wu, Chaitanya Murthy, Steven A. Kivelson. 2024-05-15. Possible Sliding Regimes in Twisted Bilayer WTe$_2$. https://doi.org/10.1103/physrevlett.133.246501

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