Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves

Song Bo Zhang, Xiaoxiong Liu, Md Shafayat Hossain, Jia Xin Yin, M. Zahid Hasan, Titus Neupert

Research output: Contribution to journalArticlepeer-review

Abstract

We propose and study a two-dimensional phase of shifted charge density waves (CDW), which is constructed from an array of weakly coupled 1D CDW wires whose phases shift from one wire to the next. We show that the fully gapped bulk CDW has topological properties, characterized by a nonzero Chern number, that imply edge modes within the bulk gap. Remarkably, these edge modes exhibit spectral pseudoflow as a function of position along the edge, and are thus dual to the chiral edge modes of Chern insulators with their spectral flow in momentum space. Furthermore, we show that the CDW edge modes are stable against interwire coupling. Our predictions can be tested experimentally in quasi-1D CDW compounds such as Ta2Se8I.

Original languageEnglish (US)
Article number106203
JournalPhysical review letters
Volume130
Issue number10
DOIs
StatePublished - Mar 10 2023

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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