Usachov, Dmitry Yu., Fedorov, Alexander V., Vilkov, Oleg Yu., Ogorodnikov, Ilya I., Kuznetsov, Mikhail V., Grüneis, Alexander, Laubschat, Clemens and Vyalikh, Denis V. (2018). Electron-phonon coupling in graphene placed between magnetic Li and Si layers on cobalt. Physical review B, 97 (15). 085132. APS Physics. ISSN 2469-9969

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DOI:doi.org/10.1103/PhysRevB.97.085132

Abstract

Using angle-resolved photoemission spectroscopy (ARPES), we study the electronic structure and electron-phonon coupling in a Li-doped graphene monolayer decoupled from the Co(0001) substrate by intercalation of silicon. Based on the photoelectron diffraction measurements, we disclose the structural properties of the Si/Co interface. Our density functional theory calculations demonstrate that in the studied Li/graphene/Si/Co system the magnetism of Co substrate induces notable magnetic moments on Li and Si atoms. At the same time graphene remains almost nonmagnetic and clamped between two magnetically active atomic layers with antiparallel magnetizations. ARPES maps of the graphene Fermi surface reveal strong electron doping, which may lead to superconductivity mediated by electron-phonon coupling (EPC). Analysis of the spectral function of photoelectrons reveals apparent anisotropy of EPC in the k space. These properties make the studied system tempting for studying the relation between superconductivity and magnetism in two-dimensional materials.

Item Type: Journal Article
Creators:
CreatorsEmailORCID
Usachov, Dmitry Yu.UNSPECIFIEDUNSPECIFIED
Fedorov, Alexander V.UNSPECIFIEDUNSPECIFIED
Vilkov, Oleg Yu.UNSPECIFIEDUNSPECIFIED
Ogorodnikov, Ilya I.UNSPECIFIEDUNSPECIFIED
Kuznetsov, Mikhail V.UNSPECIFIEDUNSPECIFIED
Grüneis, AlexanderUNSPECIFIEDUNSPECIFIED
Laubschat, ClemensUNSPECIFIEDUNSPECIFIED
Vyalikh, Denis V.UNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-81714
DOI: doi.org/10.1103/PhysRevB.97.085132
Journal or Publication Title: Physical review B
Publisher: APS Physics
ISSN: 2469-9969
Volume: 97
Number: 15
Subjects: Natural sciences and mathematics
Physics
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Institute of Physics II
Language: English
Date: 21 February 2018
Funders: SPbU esearch Grant No. 11.65.42.2017, RFBR (Grant No. 17- 02-00427), RFBR (Grant No. 16-29-06410), DFG (Grant No. LA655-17/1), ERC Grant No. 648589 “SUPER-2D”
Projects: DFG project GR 3708/2-1, DFG project CRC 1238
Refereed: Yes
Page Range: 085132
URI: http://kups.ub.uni-koeln.de/id/eprint/8171

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