A charge-density-wave topological semimetal

Shi W, Wieder BJ, Meyerheim HL, Sun Y, Zhang Y, Li Y, Shen L, Qi Y, Yang L, Jena J, Werner P, Koepernik K, Parkin S, Chen Y, Felser C, Bernevig BA, Wang Z (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Nature Physics Nature Research

Book Volume: 17

Pages Range: 381-387

Journal Issue: 3

DOI: 10.1038/s41567-020-01104-z

Abstract

Topological physics and strong electron–electron correlations in quantum materials are typically studied independently. However, there have been rapid recent developments in quantum materials in which topological phase transitions emerge when the single-particle band structure is modified by strong interactions. Here we demonstrate that the room-temperature phase of (TaSe4)2I is a Weyl semimetal with 24 pairs of Weyl nodes. Owing to its quasi-one-dimensional structure, (TaSe4)2I also hosts an established charge-density wave instability just below room temperature. We show that the charge-density wave in (TaSe4)2I couples the bulk Weyl points and opens a bandgap. The correlation-driven topological phase transition in (TaSe4)2I provides a route towards observing condensed-matter realizations of axion electrodynamics in the gapped regime, topological chiral response effects in the semimetallic phase, and represents an avenue for exploring the interplay of correlations and topology in a solid-state material.

Involved external institutions

ShanghaiTech University / 上海科技大学 CN China (CN) Tsinghua University CN China (CN) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Princeton University US United States (USA) (US) University of Oxford GB United Kingdom (GB) Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN)

How to cite

APA:

Shi, W., Wieder, B.J., Meyerheim, H.L., Sun, Y., Zhang, Y., Li, Y.,... Wang, Z. (2021). A charge-density-wave topological semimetal. Nature Physics, 17(3), 381-387. https://doi.org/10.1038/s41567-020-01104-z

MLA:

Shi, Wujun, et al. "A charge-density-wave topological semimetal." Nature Physics 17.3 (2021): 381-387.

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