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  Axionic charge-density wave in the Weyl semimetal (TaSe4)2I

Gooth, J., Bradlyn, B., Honnali, S., Schindler, C., Kumar, N., Noky, J., et al. (2019). Axionic charge-density wave in the Weyl semimetal (TaSe4)2I. Nature. doi:10.1038/s41586-019-1630-4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-CD5A-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D8F8-1
Genre: Journal Article

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 Creators:
Gooth, J.1, Author              
Bradlyn, B.2, Author
Honnali, S.3, Author              
Schindler, C.3, Author              
Kumar, N.3, Author              
Noky, J.3, Author              
Qi, Y.3, Author              
Shekhar, C.4, Author              
Sun, Y.3, Author              
Wang, Z.2, Author
Bernevig, B. A.2, Author
Felser, C.5, Author              
Affiliations:
1Nanostructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_3018212              
2External Organizations, ou_persistent22              
3Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
4Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: An axion insulator is a correlated topological phase, predicted to arise from the formation of a charge-density wave in a Weyl semimetal1,2. The accompanying sliding mode in the charge-density-wave phase, the phason, is an axion3,4. It is expected to cause anomalous magneto-electric transport effects. However, this axionic charge density wave has so far eluded experimental detection. In this paper, we report the observation of a large, positive contribution to the magneto-conductance in the sliding mode of the charge-density wave Weyl semimetal (TaSe4)2I for collinear electric and magnetic fields (E||B). The positive contribution to the magneto-conductance originates from the anomalous axionic contribution of the chiral anomaly to the phason current, and is locked to the parallel alignment of E and B. By rotating B, we show that the angular dependence of the magneto-conductance is consistent with the anomalous transport of an axionic charge-density wave.

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Language(s): eng - English
 Dates: 2019-10-072019-10-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41586-019-1630-4
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238