2024-03-28T10:55:51Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1780552020-03-17T13:11:46Zcom_10261_115com_10261_3com_10261_89col_10261_368col_10261_342
2019-03-18T08:43:54Z
urn:hdl:10261/178055
Evidence of large spin-orbit coupling effects in quasi-free-standing graphene on Pb/Ir(111)
Otrokov, M. M.
Klimovskikh, Ilya I.
Calleja, Fabián
Shikin, Alexander M.
Vilkov, Oleg Yu.
Rybkin, Artem G.
Estyunin, D.
Muff, Stefan
Dil, J. Hugo
Vázquez de Parga, A. L.
Miranda, Rodolfo
Ochoa, Héctor
Guinea, F.
Cerdá, Jorge I.
Chulkov, Eugene V.
Arnau, Andrés
Eusko Jaurlaritza
Universidad del País Vasco
Ministerio de Economía y Competitividad (España)
Tomsk State University
Comunidad de Madrid
Saint Petersburg State University
Russian Foundation for Basic Research
Russian Science Foundation
Graphene
Scanning tunneling microscopy
Spin–orbit coupling
Electronic structure
Intercalation
Angle-resolved photoemission spectroscopy
Density functional theory
A combined scanning tunneling microscopy, angle- and spin-resolved photoemission spectroscopy and density functional theory study of graphene on Ir(1 1 1) intercalated with a well-ordered, full Pb monolayer is presented. Lead intercalation between graphene and Ir(111) reduces the coupling to the metallic substrate in such a way that its corrugation becomes negligible and distortions of the linear dispersion largely disappear, while graphene's sublattice symmetry is maintained and it turns out to be n-doped. Remarkably, the spin–orbit splittings induced by the proximity of the Ir(1 1 1) surface are preserved after Pb intercalation in a wide energy range. We further show that the Pb/Ir(1 1 1) surface induces a complex spin texture with both in-plane and out-of-plane components. Our calculations reveal the origin of the out-of-plane spin components in graphene to trace back to the out-of-plane spin-polarized surface and resonance states of Ir(1 1 1), while the Pb interlayer on its own does not induce any vertical spin polarization in the carbon sheet. However, the Brillouin zone folding imposed by the rectangular symmetry of the intercalated Pb layer plays an instrumental role in the spin–orbit coupling (SOC) transfer to graphene, as well as in the linearization of its bands. Finally, since no sizeable gap is observed at the Dirac point, we suggest that an intrinsic (Kane and Mele type) SOC does not exceed the extrinsic (Rashba) SOC for graphene on Pb/Ir(111).
2019-03-18T08:43:54Z
2019-03-18T08:43:54Z
2018
artículo
2D Materials 5(3): 035029 (2018)
http://hdl.handle.net/10261/178055
10.1088/2053-1583/aac596
2053-1583
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100004285
http://dx.doi.org/10.13039/501100003086
http://dx.doi.org/10.13039/501100002261
http://dx.doi.org/10.13039/501100006769
http://dx.doi.org/10.13039/501100008566
http://dx.doi.org/10.13039/100012818
eng
Publisher's version
https://doi.org/10.1088/2053-1583/aac596
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2016- 75862-P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2015-66888-C3-1-R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2015-67367-C2-1-P
S2013/MIT-2850/NANOFRONTMAG
S2013/MIT-3007/MAD2DCM
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2016-0686
http://creativecommons.org/licenses/by/3.0
openAccess
Institute of Physics Publishing