TY - JOUR
T1 - Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves
AU - Zhang, Song Bo
AU - Liu, Xiaoxiong
AU - Hossain, Md Shafayat
AU - Yin, Jia Xin
AU - Hasan, M. Zahid
AU - Neupert, Titus
N1 - Funding Information:
We thank Claudia Felser and Glenn Wagner for fruitful discussions. This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programm (ERC-StG-Neupert-757867-PARATOP) and from NCCR MARVEL funded by the SNSF. Materials characterization and the study of topological quantum properties were supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center and Princeton University.
Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/3/10
Y1 - 2023/3/10
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.130.106203
DO - 10.1103/PhysRevLett.130.106203
M3 - Article
C2 - 36962034
AN - SCOPUS:85150800873
SN - 0031-9007
VL - 130
JO - Physical review letters
JF - Physical review letters
IS - 10
M1 - 106203
ER -