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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

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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
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
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:
DateEvent
3 August 2015Published
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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