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Spin-orbit coupling induced gap in graphene

By means of angle-resolved photoemission spectroscopy (ARPES), we show that intercalation of a Pb monolayer between the graphene sheet and the Pt(111) surface leads to formation of a gap of about 200 meV at the Dirac point of graphene. Spin-resolved photoemission (SRPES) measurements confirm the splitting to be of a spin−orbit nature, and the measured near-gap spin structure resembles that of the quantum spin Hall (QSH) state in graphene, proposed by Kane and Mele [Phys. Rev. Lett. 95, 226801 (2005)]. With a bandstructure tuned in this way, graphene acquires a functionality going beyond its intrinsic properties and becomes more attractive for possible spintronic applications.

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Spin−orbit coupling induced gap in graphene on Pt(111) with intercalated Pb monolayer
I.I. Klimovskikh, M.M. Otrokov, V.Yu. Voroshnin, D. Sostina, L. Petaccia, G. Di Santo, S. Thakur, E.V. Chulkov, A.M. Shikin,
ACS Nano 11, 368 (2017).
doi: 10.1021/acsnano.6b05982

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ACS Nano 11, 10630 (2017).
doi: 10.1021/acsnano.7b06779

This paper was selected as an Elettra Top Story.

Last Updated on Monday, 25 March 2019 16:23