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Temperature dependa...
Temperature dependance of Intrinsic Spin Orbit Coupling Gap in Graphene probed by Terahertz photoconductivity
- Article/chapterEnglish2023
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LIBRIS-ID:oai:research.chalmers.se:b9dd0233-13ee-45e8-ae9a-0ff4f3405df5
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https://research.chalmers.se/publication/538634URI
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https://doi.org/10.1109/IRMMW-THz57677.2023.10299006DOI
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Language:English
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Summary in:English
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Subject category:kon swepub-publicationtype
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Subject category:ref swepub-contenttype
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Graphene is a quantum spin Hall insulator, with a nontrivial topological gap induced by the spin-orbit coupling. Such splitting is weak (∼ 45 μ eV) in the absence of external magnetic field. However, due to rather long spin-relaxation time, graphene is an attractive candidate for applications in quantum technologies. When it is encapsulated in hexagonal boron nitride, the coupling between graphene and the substrate compensates intrinsic spin-orbit coupling and decreases the nontrivial topological gap, which may lead to phase transition into a trivial band insulator state. In this work, we have measured experimentally the zero-field splittings in monolayer and bilayer graphene by the means of subterahertz photoconductivity-based electron spin resonance technique. The dependance in temperature of such splittings have been also studied in the 2-12K range. We observed a decrease of the spin splittings with increasing temperature. Such behavior might be understood from several physical mechanisms that could induce a temperature dependence of the spin-orbit coupling. These includes the difference in the expansion coefficients between the graphene and the boron nitride substrate or the metal contacts, the electronphonon interactions, and the presence of a magnetic order at low temperature.
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Dinar, K.Laboratoire Charles Coulomb
(author)
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Bray, C.Laboratoire Charles Coulomb
(author)
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Consejo, C.Laboratoire Charles Coulomb
(author)
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Delgado-Notario, J. A.Polish Academy of Sciences,Universidad de Salamanca,University of Salamanca
(author)
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Krishtopenko, S.Laboratoire Charles Coulomb
(author)
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Yahniuk, I.Universität Regensburg,University of Regensburg,Polish Academy of Sciences
(author)
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Gerbert, S.Laboratoire Charles Coulomb
(author)
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Ruffenach, S.Laboratoire Charles Coulomb
(author)
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Moench, E.Universität Regensburg,University of Regensburg
(author)
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Indykiewicz, KorneliaPolitechnika Wrocławska,Wrocław University of Science and Technology
(author)
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Benhamoumbui, B.Laboratoire Charles Coulomb
(author)
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Jouault, B.Laboratoire Charles Coulomb
(author)
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Torres, J.
(author)
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Meziani, Y. M.Universidad de Salamanca,University of Salamanca
(author)
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Knap, W.Laboratoire Charles Coulomb
(author)
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Yurgens, Avgust,1959Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)yurgens
(author)
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Ganichev, S.D.Universität Regensburg,University of Regensburg,Polish Academy of Sciences
(author)
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Teppe, F.Laboratoire Charles Coulomb
(author)
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Laboratoire Charles CoulombPolish Academy of Sciences
(creator_code:org_t)
Related titles
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In:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz2162-20272162-2035
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Maussang, K.
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Dinar, K.
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Bray, C.
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Consejo, C.
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Delgado-Notario, ...
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Krishtopenko, S.
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Yahniuk, I.
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Gerbert, S.
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Ruffenach, S.
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Moench, E.
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Indykiewicz, Kor ...
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Benhamoumbui, B.
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Jouault, B.
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Torres, J.
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Meziani, Y. M.
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Knap, W.
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Yurgens, Avgust, ...
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Ganichev, S.D.
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Teppe, F.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Chalmers University of Technology