Sliding Charge Density Wave observed through Band Structure

TL;DR

This paper demonstrates that the sliding state of an incommensurate charge density wave (CDW) can be detected via band structure changes observed with ARPES, linking lattice deformation to electronic structure.

Contribution

It provides experimental evidence of broken symmetry in k-space during CDW sliding, confirming theoretical predictions using ARPES on TbTe3.

Findings

Broken symmetry observed in ARPES during sliding

Band structure deformation correlates with CDW sliding

Experimental validation of theoretical models

Abstract

An incommensurate CDW may have the ability to slide, i.e., to generate an excess of current when the system is submitted to an external field. Sliding phenomenon is closely related to deformation of the periodic lattice distortion associated to the CDW. In principle, however, the sliding state can also be observed through the band structure. Here we show that broken symmetry in k-space is observed by Angle-Resolved Photoemission Spectroscopy (ARPES) in the sliding regime of TbTe$_3$, which could be consistent with theoretical predictions.