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

Gooth, J.; Bradlyn, B.; Honnali, S.; Schindler, C.; Kumar, N.; Noky, J.; Qi, Y.; Shekhar, C.; Sun, Y.; Wang, Z.; Bernevig, B. A.; Felser, C.

doi:10.1038/s41586-019-1630-4

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

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Gooth, J.
Nanostructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Honnali, S.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schindler, C.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kumar, N.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Noky, J.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Qi, Y.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126847

Shekhar, C.
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sun, Y.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126601

Felser, C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0004-CD5A-1

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.