Universität zu Köln

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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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:	Article
Creators:	Creators Email ORCID ORCID Put Code Usachov, Dmitry Yu. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorov, Alexander V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vilkov, Oleg Yu. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ogorodnikov, Ilya I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuznetsov, Mikhail V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grüneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Laubschat, Clemens UNSPECIFIED UNSPECIFIED UNSPECIFIED Vyalikh, Denis V. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-81714
Identification Number:	doi.org/10.1103/PhysRevB.97.085132
Journal or Publication Title:	Physical review B
Volume:	97
Number:	15
Page Range:	085132
Date:	21 February 2018
Publisher:	APS Physics
ISSN:	2469-9969
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	Natural sciences and mathematics Physics
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
URI:	http://kups.ub.uni-koeln.de/id/eprint/8171