Unusual interlayer quantum transport behavior caused by the zeroth Landau level in YbMnBi2

J. Y. Liu; J. Hu; D. Graf; T. Zou; M. Zhu; Y. Shi; S. Che; S. M.A. Radmanesh; C. N. Lau; L. Spinu; H. B. Cao; X. Ke; Z. Q. Mao

doi:10.1038/s41467-017-00673-7

Unusual interlayer quantum transport behavior caused by the zeroth Landau level in YbMnBi₂

J. Y. Liu, J. Hu, D. Graf, T. Zou, M. Zhu, Y. Shi, S. Che, S. M.A. Radmanesh, C. N. Lau, L. Spinu, H. B. Cao, X. Ke, Z. Q. Mao

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Abstract

Relativistic fermions in topological quantum materials are characterized by linear energy-momentum dispersion near band crossing points. Under magnetic fields, relativistic fermions acquire Berry phase of π in cyclotron motion, leading to a zeroth Landau level (LL) at the crossing point, a signature unique to relativistic fermions. Here we report the unusual interlayer quantum transport behavior resulting from the zeroth LL mode observed in the time reversal symmetry breaking type II Weyl semimetal YbMnBi₂. The interlayer magnetoresistivity and Hall conductivity of this material are found to exhibit surprising angular dependences under high fields, which can be well fitted by a model, which considers the interlayer quantum tunneling transport of the zeroth LL's Weyl fermions. Our results shed light on the unusual role of zeroth LLl mode in transport.

Original language	English
Article number	646
Journal	Nature Communications
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41467-017-00673-7
State	Published - Dec 1 2017

Funding

We thank the informative discussions with Sergey Borisenko. The work at Tulane is supported by the U.S. Department of Energy under EPSCoR Grant No. DE-SC0012432 with additional support from the Louisiana Board of Regents (support for personnel, materials, and travel). The work at the National High Magnetic Field Laboratory is supported by the NSF grant No. DMR-1206267, the NSF Cooperative Agreement No. DMR-1157490, and the State of Florida (support for high-field measurements). The work at UCR is supported by DOE BES Division under grant no. ER 46940-DE-SC0010597 (partial support for high-field measurements). X.K. acknowledges the start-up funds from Michigan State University. The neutron-scattering experiment at ORNL was sponsored by the Scientific User Facilities Division, Office of Science, Basic Energy Sciences, U.S. Department of Energy.

Funders	Funder number
DOE BES Division
Scientific User Facilities Division
National Science Foundation
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1157490, 1206267
Directorate for Mathematical and Physical Sciences
Office of Experimental Program to Stimulate Competitive Research
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory
Tulane University
National High Magnetic Field Laboratory
Universidad de Costa Rica

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abstract = "Relativistic fermions in topological quantum materials are characterized by linear energy-momentum dispersion near band crossing points. Under magnetic fields, relativistic fermions acquire Berry phase of π in cyclotron motion, leading to a zeroth Landau level (LL) at the crossing point, a signature unique to relativistic fermions. Here we report the unusual interlayer quantum transport behavior resulting from the zeroth LL mode observed in the time reversal symmetry breaking type II Weyl semimetal YbMnBi2. The interlayer magnetoresistivity and Hall conductivity of this material are found to exhibit surprising angular dependences under high fields, which can be well fitted by a model, which considers the interlayer quantum tunneling transport of the zeroth LL's Weyl fermions. Our results shed light on the unusual role of zeroth LLl mode in transport.",

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AU - Liu, J. Y.

AU - Hu, J.

AU - Graf, D.

AU - Zou, T.

AU - Zhu, M.

AU - Shi, Y.

AU - Che, S.

AU - Radmanesh, S. M.A.

AU - Lau, C. N.

AU - Spinu, L.

AU - Cao, H. B.

AU - Ke, X.

AU - Mao, Z. Q.

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AB - Relativistic fermions in topological quantum materials are characterized by linear energy-momentum dispersion near band crossing points. Under magnetic fields, relativistic fermions acquire Berry phase of π in cyclotron motion, leading to a zeroth Landau level (LL) at the crossing point, a signature unique to relativistic fermions. Here we report the unusual interlayer quantum transport behavior resulting from the zeroth LL mode observed in the time reversal symmetry breaking type II Weyl semimetal YbMnBi2. The interlayer magnetoresistivity and Hall conductivity of this material are found to exhibit surprising angular dependences under high fields, which can be well fitted by a model, which considers the interlayer quantum tunneling transport of the zeroth LL's Weyl fermions. Our results shed light on the unusual role of zeroth LLl mode in transport.

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Unusual interlayer quantum transport behavior caused by the zeroth Landau level in YbMnBi₂

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