Universität zu Köln

Voroshnin, Vladimir ORCID: 0000-0002-9320-1180, Tarasov, Artem V., Bokai, Kirill A., Chikina, Alla ORCID: 0000-0003-3635-6503, Senkovskiy, Boris V., Ehlen, Niels ORCID: 0000-0002-8581-8359, Usachov, Dmitry Yu., Gruneis, Alexander ORCID: 0000-0003-2448-6060, Krivenkov, Maxim, Sanchez-Barriga, Jaime and Fedorov, Alexander ORCID: 0000-0002-9228-7082 (2022). Direct Spectroscopic Evidence of Magnetic Proximity Effect in MoS2 Monolayer on Graphene/Co. ACS Nano, 16 (5). S. 7448 - 7457. WASHINGTON: AMER CHEMICAL SOC. ISSN 1936-086X

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Abstract

A magnetic field modifies optical properties and provides valley splitting in a molybdenum disulfide (MoS2) monolayer. Here we demonstrate a scalable approach to the epitaxial synthesis of MoS2 monolayer on a magnetic graphene/Co system. Using spin- and angle-resolved photoemission spectroscopy we observe a magnetic proximity effect that causes a 20 meV spin-splitting at the (Gamma) over bar point and canting of spins at the (K) over bar point in the valence band toward the in-plane direction of cobalt magnetization. Our density functional theory calculations reveal that the in-plane spin component at (K) over bar is localized on Co atoms in the valence band, while in the conduction band it is localized on the MoS2 layer. The calculations also predict a 16 meV spin-splitting at the (Gamma) over bar point and 8 meV (K) over bar-(K) over bar' valley asymmetry for an out-of-plane magnetization. These findings suggest control over optical transitions in MoS2 via Co magnetization. Our estimations show that the magnetic proximity effect is equivalent to the action of the magnetic field as large as 100 T.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Voroshnin, Vladimir UNSPECIFIED orcid.org/0000-0002-9320-1180 UNSPECIFIED Tarasov, Artem V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bokai, Kirill A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chikina, Alla UNSPECIFIED orcid.org/0000-0003-3635-6503 UNSPECIFIED Senkovskiy, Boris V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ehlen, Niels UNSPECIFIED orcid.org/0000-0002-8581-8359 UNSPECIFIED Usachov, Dmitry Yu. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruneis, Alexander UNSPECIFIED orcid.org/0000-0003-2448-6060 UNSPECIFIED Krivenkov, Maxim UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Barriga, Jaime UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorov, Alexander UNSPECIFIED orcid.org/0000-0002-9228-7082 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-688716
DOI:	10.1021/acsnano.1c10391
Journal or Publication Title:	ACS Nano
Volume:	16
Number:	5
Page Range:	S. 7448 - 7457
Date:	2022
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1936-086X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DER-WAALS EPITAXY; LAYER MOS2; PHOTOLUMINESCENCE; HETEROSTRUCTURES Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68871