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  • Maussang, K. (author)

Temperature dependance of Intrinsic Spin Orbit Coupling Gap in Graphene probed by Terahertz photoconductivity

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023

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  • LIBRIS-ID:oai:research.chalmers.se:b9dd0233-13ee-45e8-ae9a-0ff4f3405df5
  • https://research.chalmers.se/publication/538634URI
  • https://doi.org/10.1109/IRMMW-THz57677.2023.10299006DOI

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  • Language:English
  • Summary in:English

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  • Subject category:kon swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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)
  • Bray, C.Laboratoire Charles Coulomb (author)
  • Consejo, C.Laboratoire Charles Coulomb (author)
  • Delgado-Notario, J. A.Polish Academy of Sciences,Universidad de Salamanca,University of Salamanca (author)
  • Krishtopenko, S.Laboratoire Charles Coulomb (author)
  • Yahniuk, I.Universität Regensburg,University of Regensburg,Polish Academy of Sciences (author)
  • Gerbert, S.Laboratoire Charles Coulomb (author)
  • Ruffenach, S.Laboratoire Charles Coulomb (author)
  • Moench, E.Universität Regensburg,University of Regensburg (author)
  • Indykiewicz, KorneliaPolitechnika Wrocławska,Wrocław University of Science and Technology (author)
  • Benhamoumbui, B.Laboratoire Charles Coulomb (author)
  • Jouault, B.Laboratoire Charles Coulomb (author)
  • Torres, J. (author)
  • Meziani, Y. M.Universidad de Salamanca,University of Salamanca (author)
  • Knap, W.Laboratoire Charles Coulomb (author)
  • Yurgens, Avgust,1959Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)yurgens (author)
  • Ganichev, S.D.Universität Regensburg,University of Regensburg,Polish Academy of Sciences (author)
  • Teppe, F.Laboratoire Charles Coulomb (author)
  • Laboratoire Charles CoulombPolish Academy of Sciences (creator_code:org_t)

Related titles

  • In:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz2162-20272162-2035

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