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Origin and evolution of surface spin current in topological insulators
Chalmers Univ Technol, Quantum Device Lab, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden..
Chalmers Univ Technol, Quantum Device Lab, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden..
Chalmers Univ Technol, Quantum Device Lab, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden..
Chalmers Univ Technol, Quantum Device Lab, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden..
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 12, article id 125414Article in journal (Refereed) Published
Abstract [en]

The Dirac surface states of topological insulators offer a unique possibility for creating spin polarized charge currents due to the spin-momentum locking. Here we demonstrate that the control over the bulk and surface contribution is crucial to maximize the charge-to-spin conversion efficiency. We observe an enhancement of the spin signal due to surface-dominated spin polarization while freezing out the bulk conductivity in semiconducting Bi1.5Sb0.5Te1.7Se1.3 below 100 K. Detailed measurements up to room temperature exhibit a strong reduction of the magnetoresistance signal between 2 and 100 K, which we attribute to the thermal excitation of bulk carriers and to the electron-phonon coupling in the surface states. The presence and dominance of this effect up to room temperature is promising for spintronic science and technology.

Place, publisher, year, edition, pages
2018. Vol. 97, no 12, article id 125414
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-350611DOI: 10.1103/PhysRevB.97.125414ISI: 000427313800004OAI: oai:DiVA.org:uu-350611DiVA, id: diva2:1209485
Funder
Swedish Research Council, 2015-06813Swedish Research Council, 2016-03658EU, Horizon 2020, 696656
Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2018-05-23Bibliographically approved

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Kamalakar, M. Venkata

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