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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, 575(7782), 315-319. doi:10.1038/s41586-019-1630-4.

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Gooth, J.1, Autor           
Bradlyn, B.2, Autor
Honnali, S.3, Autor           
Schindler, C.3, Autor           
Kumar, N.3, Autor           
Noky, J.3, Autor           
Qi, Y.3, Autor           
Shekhar, C.4, Autor           
Sun, Y.3, Autor           
Wang, Z.2, Autor
Bernevig, B. A.2, Autor
Felser, C.5, Autor           
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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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2019-10-072019-10-07
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1038/s41586-019-1630-4
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Titel: Nature
  Kurztitel : Nature
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: - Band / Heft: 575 (7782) Artikelnummer: - Start- / Endseite: 315 - 319 Identifikator: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238