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Negative longitudinal magnetoresistance from anomalous N=0 Landau level in topological materials

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Assaf, B. A., Phuphachong, T., Kampert, Erik, Volobuev, V. V., Mandal, P. S., Sánchez-Barriga, J., Rader, O., Bauer, G., Springholz, G., de Vaulchier, L. A. and Guldner, Y. (2017) Negative longitudinal magnetoresistance from anomalous N=0 Landau level in topological materials. Physical Review Letters, 119 (10). 106602 . doi:10.1103/PhysRevLett.119.106602 ISSN 0031-9007.

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.119.106602

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Abstract

Negative longitudinal magnetoresistance (NLMR) is shown to occur in topological materials in the extreme quantum limit, when a magnetic field is applied parallel to the excitation current. We perform pulsed and DC field measurements on Pb1-xSnxSe epilayers where the topological state can be chemically tuned. The NLMR is observed in the topological state, but is suppressed and becomes positive when the system becomes trivial. In a topological material, the lowest N=0 conduction Landau level disperses down in energy as a function of increasing magnetic field, while the N=0 valence Landau level disperses upwards. This anomalous behavior is shown to be responsible for the observed NLMR. Our work provides an explanation of the outstanding question of NLMR in topological insulators and establishes this effect as a possible hallmark of bulk conduction in topological matter.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Electric insulators and insulation, Magnetoresistance, Landau levels, Topology
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 8 September 2017
Dates:
DateEvent
8 September 2017Published
10 August 2017Accepted
Volume: 119
Number: 10
Number of Pages: 15
Article Number: 106602
DOI: 10.1103/PhysRevLett.119.106602
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 11 September 2017
Date of first compliant Open Access: 11 September 2017
Funder: France. Agence nationale de la recherche (ANR), Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) [Austrian Science Fund] (FFWF)
Grant number: ANR-10-LABX-0010 (ANR), ANR-10-IDEX-0001-02 PSL (ANR), SFB F2504-N17 IRON (FFWF)

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