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Robust local and nonlocal transport in the topological Kondo insulator SmB6in the presence of a high magnetic field
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Biswas, Sangram, Nagarajan, Ramya, Sarkar, Suman, Amin, Kazi Rafsanjani, Ciomaga Hatnean, Monica, Tewari, S., Balakrishnan, Geetha and Bid, Aveek (2015) Robust local and nonlocal transport in the topological Kondo insulator SmB6in the presence of a high magnetic field. Physical Review B, 92 (8). 085103. doi:10.1103/PhysRevB.92.085103
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Official URL: http://dx.doi.org/10.1103/PhysRevB.92.085103
Abstract
SmB6 has been predicted to be a Kondo topological insulator with topologically protected conducting surface states.We have studied quantitatively the electrical transport through surface states in high-quality single crystals of SmB6. We observe a large nonlocal surface signal at temperatures lower than the bulk Kondo gap scale. Measurements and finite-element simulations allow us to distinguish unambiguously between the contributions from different transport channels. In contrast to general expectations, the electrical transport properties of the surface channels were found to be insensitive to high magnetic fields. We propose possible scenarios that might explain this unexpected finding. Local and nonlocal magnetoresistance measurements allowed us to identify possible signatures of helical spin states and strong interband scattering at the surface.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Superconductors, Spintronics, Fermions, Surfaces (Physics), Magnetoresistance | ||||
| Journal or Publication Title: | Physical Review B | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 3 August 2015 | ||||
| Dates: |
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| Date of first compliant deposit: | 24 April 2017 | ||||
| Volume: | 92 | ||||
| Number: | 8 | ||||
| Article Number: | 085103 | ||||
| DOI: | 10.1103/PhysRevB.92.085103 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Copyright Holders: | American Physical Society | ||||
| Funder: | India. Department of Science and Technology (DST), Indian Institute of Science, Bangalore, Engineering and Physical Sciences Research Council (EPSRC) | ||||
| Grant number: | EP/L014963/1 (EPSRC) |
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