Evidence for two dimensional anisotropic Luttinger liquids at millikelvin temperatures

Guo Yu, Pengjie Wang, Ayelet J. Uzan-Narovlansky, Yanyu Jia, Michael Onyszczak, Ratnadwip Singha, Xin Gui, Tiancheng Song, Yue Tang, Kenji Watanabe, Takashi Taniguchi, Robert J. Cava, Leslie M. Schoop and Sanfeng Wu ()
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Guo Yu: Princeton University
Pengjie Wang: Princeton University
Ayelet J. Uzan-Narovlansky: Princeton University
Yanyu Jia: Princeton University
Michael Onyszczak: Princeton University
Ratnadwip Singha: Princeton University
Xin Gui: Princeton University
Tiancheng Song: Princeton University
Yue Tang: Princeton University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Robert J. Cava: Princeton University
Leslie M. Schoop: Princeton University
Sanfeng Wu: Princeton University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Interacting electrons in one dimension (1D) are governed by the Luttinger liquid (LL) theory in which excitations are fractionalized. Can a LL-like state emerge in a 2D system as a stable zero-temperature phase? This question is crucial in the study of non-Fermi liquids. A recent experiment identified twisted bilayer tungsten ditelluride (tWTe2) as a 2D host of LL-like physics at a few kelvins. Here we report evidence for a 2D anisotropic LL state down to 50 mK, spontaneously formed in tWTe2 with a twist angle of ~ 3o. While the system is metallic-like and nearly isotropic above 2 K, a dramatically enhanced electronic anisotropy develops in the millikelvin regime. In the anisotropic phase, we observe characteristics of a 2D LL phase including a power-law across-wire conductance and a zero-bias dip in the along-wire differential resistance. Our results represent a step forward in the search for stable LL physics beyond 1D.

Date: 2023
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DOI: 10.1038/s41467-023-42821-2

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