Anomalous conductivity tensor in the Dirac semimetal Na3Bi

Jun Xiong; Satya Kushwaha; Jason Krizan; Tian Liang; R. J. Cava; N. P. Ong

doi:10.1209/0295-5075/114/27002

Anomalous conductivity tensor in the Dirac semimetal Na₃Bi

Jun Xiong, Satya Kushwaha, Jason Krizan, Tian Liang, R. J. Cava, N. P. Ong

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78 Scopus citations

Abstract

Na₃Bi is a Dirac semimetal with protected nodes that may be sensitive to the breaking of time-reversal invariance in a magnetic field B. We report experiments which reveal that both the conductivity and resistivity tensors exhibit robust anomalies in B. The resistivity φ_xx is B-linear up to 35 T, while the Hall angle exhibits an unusual profile approaching a step function. The conductivities σ_xx and σ_xy share identical power-law dependences at large B. We propose that these significant deviations from conventional transport result from an unusual sensitivity of the transport lifetime to B. The transport features are compared with those in Cd₃As₂.

Original language	English (US)
Article number	27002
Journal	EPL
Volume	114
Issue number	2
DOIs	https://doi.org/10.1209/0295-5075/114/27002
State	Published - Apr 2016

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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title = "Anomalous conductivity tensor in the Dirac semimetal Na3Bi",

abstract = "Na3Bi is a Dirac semimetal with protected nodes that may be sensitive to the breaking of time-reversal invariance in a magnetic field B. We report experiments which reveal that both the conductivity and resistivity tensors exhibit robust anomalies in B. The resistivity φxx is B-linear up to 35 T, while the Hall angle exhibits an unusual profile approaching a step function. The conductivities σxx and σxy share identical power-law dependences at large B. We propose that these significant deviations from conventional transport result from an unusual sensitivity of the transport lifetime to B. The transport features are compared with those in Cd3As2.",

author = "Jun Xiong and Satya Kushwaha and Jason Krizan and Tian Liang and Cava, {R. J.} and Ong, {N. P.}",

note = "Funding Information: NPO is supported by the Army Research Office (ARO W911NF-11-1-0379). RJC and NPO are supported by a MURI grant on Topological Insulators (ARO W911NF-12-1-0461). The crystal growth effort was supported by the US National Science Foundation (grant No. DMR 1420541). TL acknowledges scholarship support from the Japan Student Services Organization. Some of the experiments were performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490, the State of Florida, and the U.S. Department of Energy. Publisher Copyright: Copyright {\textcopyright} EPLA, 2016.",

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doi = "10.1209/0295-5075/114/27002",

language = "English (US)",

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AU - Xiong, Jun

AU - Kushwaha, Satya

AU - Krizan, Jason

AU - Liang, Tian

AU - Cava, R. J.

AU - Ong, N. P.

N1 - Funding Information: NPO is supported by the Army Research Office (ARO W911NF-11-1-0379). RJC and NPO are supported by a MURI grant on Topological Insulators (ARO W911NF-12-1-0461). The crystal growth effort was supported by the US National Science Foundation (grant No. DMR 1420541). TL acknowledges scholarship support from the Japan Student Services Organization. Some of the experiments were performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490, the State of Florida, and the U.S. Department of Energy. Publisher Copyright: Copyright © EPLA, 2016.

PY - 2016/4

Y1 - 2016/4

N2 - Na3Bi is a Dirac semimetal with protected nodes that may be sensitive to the breaking of time-reversal invariance in a magnetic field B. We report experiments which reveal that both the conductivity and resistivity tensors exhibit robust anomalies in B. The resistivity φxx is B-linear up to 35 T, while the Hall angle exhibits an unusual profile approaching a step function. The conductivities σxx and σxy share identical power-law dependences at large B. We propose that these significant deviations from conventional transport result from an unusual sensitivity of the transport lifetime to B. The transport features are compared with those in Cd3As2.

AB - Na3Bi is a Dirac semimetal with protected nodes that may be sensitive to the breaking of time-reversal invariance in a magnetic field B. We report experiments which reveal that both the conductivity and resistivity tensors exhibit robust anomalies in B. The resistivity φxx is B-linear up to 35 T, while the Hall angle exhibits an unusual profile approaching a step function. The conductivities σxx and σxy share identical power-law dependences at large B. We propose that these significant deviations from conventional transport result from an unusual sensitivity of the transport lifetime to B. The transport features are compared with those in Cd3As2.

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Anomalous conductivity tensor in the Dirac semimetal Na₃Bi

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