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Temperature-depende...
Temperature-dependent zero-field splittings in graphene
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- Bray, C. (author)
- Laboratoire Charles Coulomb
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Maussang, K. (author)
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- Consejo, C. (author)
- Laboratoire Charles Coulomb
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- Delgado-Notario, J. A. (author)
- Universidad de Salamanca,University of Salamanca,Polish Academy of Sciences
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- Krishtopenko, S. (author)
- Laboratoire Charles Coulomb
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- Yahniuk, I. (author)
- Polish Academy of Sciences,Universität Regensburg,University of Regensburg
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- Gebert, S. (author)
- Laboratoire Charles Coulomb
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- Ruffenach, S. (author)
- Laboratoire Charles Coulomb
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- Dinar, K. (author)
- Laboratoire Charles Coulomb
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- Moench, E. (author)
- Universität Regensburg,University of Regensburg
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- Eroms, J. (author)
- Universität Regensburg,University of Regensburg
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- Indykiewicz, Kornelia (author)
- Politechnika Wrocławska,Wrocław University of Science and Technology
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- Jouault, B. (author)
- Laboratoire Charles Coulomb
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Torres, J. (author)
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- Meziani, Y. M. (author)
- Universidad de Salamanca,University of Salamanca
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- Knap, W. (author)
- Polish Academy of Sciences
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- Yurgens, Avgust, 1959 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ganichev, S.D. (author)
- Polish Academy of Sciences,Universität Regensburg,University of Regensburg
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- Teppe, F. (author)
- Laboratoire Charles Coulomb,Polish Academy of Sciences
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(creator_code:org_t)
- 2022
- 2022
- English.
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In: Physical Review B. - 2469-9969 .- 2469-9950. ; 106:24
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https://doi.org/10.1...
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Abstract
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- Graphene is a quantum spin Hall insulator with a 45μeV-wide nontrivial topological gap induced by the intrinsic spin-orbit coupling. Even though this zero-field spin splitting is weak, it makes graphene an attractive candidate for applications in quantum technologies, given the resulting long spin-relaxation time. On the other side, the staggered sublattice potential, resulting from the coupling of graphene with its boron nitride substrate, compensates intrinsic spin-orbit coupling and decreases the nontrivial topological gap, which may lead to the phase transition into trivial band insulator state. In this work, we present extensive experimental studies of the zero-field splittings in monolayer and bilayer graphene in a temperature range 2-12 K by means of subterahertz photoconductivity-based electron spin-resonance technique. Surprisingly, we observe a decrease of the spin splittings with increasing temperature. We discuss the origin of this phenomenon by considering possible physical mechanisms likely to induce a temperature dependence of the spin-orbit coupling. These include the difference in the expansion coefficients between the graphene and the boron nitride substrate or the metal contacts, the electron-phonon interactions, and the presence of a magnetic order at low temperature. Our experimental observation expands knowledge about the nontrivial topological gap in graphene.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Bray, C.
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Maussang, K.
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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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show more...
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Gebert, S.
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Ruffenach, S.
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Dinar, K.
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Moench, E.
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Eroms, J.
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Indykiewicz, Kor ...
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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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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Theoretical Chem ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Physical Review ...
- By the university
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Chalmers University of Technology