Evidence for two dimensional anisotropic Luttinger liquids at millikelvin temperatures

Authors:
Open Access
Publisher website
Google Scholar
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.
Funding Information
  • United States Department of Defense | United States Navy | Office of Naval Research (N00014-21-1-2804)
  • NSF | Directorate for Mathematical & Physical Sciences | Division of Materials Research (DMR-1942942, DMR-2011750)
  • NSF | Directorate for Mathematical & Physical Sciences | Division of Materials Research

This publication has 30 references indexed in Scilit: