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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;

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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;

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


Cite as: http://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.