@article{865a6136fcfa49e1bf35991027240736,
title = "A charge-density-wave topological semimetal",
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.",
author = "Wujun Shi and Wieder, {Benjamin J.} and Meyerheim, {Holger L.} and Yan Sun and Yang Zhang and Yiwei Li and Lei Shen and Yanpeng Qi and Lexian Yang and Jagannath Jena and Peter Werner and Klaus Koepernik and Stuart Parkin and Yulin Chen and Claudia Felser and Bernevig, {B. Andrei} and Zhijun Wang",
note = "Funding Information: We thank B. Bradlyn, K. Franke, Y. Hu and J. C. Y. Teo for helpful discussions. The first-principles calculations of the electronic structure, electronic susceptibility and quasiparticle interference patterns of (TaSe4)2I were supported by DOE grant no. DE-SC0016239. B.J.W. and B.A.B. were additionally supported by NSF EAGER grant no. DMR 1643312, NSF-MRSEC grants nos. DMR-2011750 and DMR-142051, Simons Investigator grant no. 404513, ONR grants nos. N00014-14-1-0330 and N00014-20-1-2303, the BSF Israel US Foundation grant no. 2018226, the Packard Foundation, the Schmidt Fund for Innovative Research and a Guggenheim Fellowship from the John Simon Guggenheim Memorial Foundation. Z.W. was supported by the National Natural Science Foundation of China (grant no. 11974395), the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS; grant no. XDB33000000), the Center for Materials Genome, and the CAS Pioneer Hundred Talents Program. H.L.M. acknowledges financial support from DFG through the priority program SPP1666 (Topological Insulators). Technical support by F. Weiss is gratefully acknowledged. H.L.M. thanks the staff of the ESRF for their hospitality during his stay in Grenoble, and additionally acknowledges helpful interactions with G. Castro, J. Rubio-Zuazo, K. Mohseni and R. Felici during experiments performed at the ESRF. W.S., Y.S., Y.Z. and C.F. were supported by ERC Advanced grant no. 291472 {\textquoteleft}Idea Heusler{\textquoteright}, ERC Advanced grant no. 742068–TOPMAT and Deutsche Forschungsgemeinschaft DFG under SFB 1143. W.S. additionally acknowledges support from the Shanghai high-repetition-rate XFEL and extreme light facility (SHINE). Y.Q. acknowledges support by the National Natural Science Foundation of China (grant nos. U1932217 and 11974246). Some of the calculations were carried out at the HPC Platform of ShanghaiTech University Library and Information Services and at the School of Physical Science and Technology. Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer Nature Limited.",
year = "2021",
month = mar,
doi = "10.1038/s41567-020-01104-z",
language = "English (US)",
volume = "17",
pages = "381--387",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "3",
}