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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
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 | ||||||
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| 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: |
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| 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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