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

Zhang，Song Bo1; Liu，Xiaoxiong1; Hossain，Md Shafayat2; Yin，Jia Xin3; Hasan，M. Zahid2,4,5,6; Neupert，Titus1

2023-03-10

10.1103/PhysRevLett.130.106203

Physical Review Letters   Impact Factor & Quartile

0031-9007

1079-7114

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.

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PHYSICS

2-s2.0-85150800873

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1.Department of Physics,University of Zürich,Zürich,Winterthurerstrasse 190,8057,Switzerland
2.Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7),Department of Physics,Princeton University,Princeton,08540,United States
3.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
4.Princeton Institute for the Science and Technology of Materials,Princeton University,Princeton,08540,United States
5.Materials Sciences Division,Lawrence Berkeley National Laboratory,Berkeley,94720,United States
6.Quantum Science Center,Oak Ridge,37831,United States

Zhang，Song Bo,Liu，Xiaoxiong,Hossain，Md Shafayat,et al. Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves[J]. Physical Review Letters,2023,130(10).

Zhang，Song Bo,Liu，Xiaoxiong,Hossain，Md Shafayat,Yin，Jia Xin,Hasan，M. Zahid,&Neupert，Titus.(2023).Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves.Physical Review Letters,130(10).

Zhang，Song Bo,et al."Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves".Physical Review Letters 130.10(2023).