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Probing giant Zeeman shift in vanadium-doped WSe2 via resonant magnetotunneling transport

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Title
Probing giant Zeeman shift in vanadium-doped WSe2 via resonant magnetotunneling transport
Author(s)
Jinbao Jiang; Lan-Anh T. Nguyen; Tuan Dung Nguyen; Dinh Hoa Luong; Duk Young Kim; Youngjo Jin; Philip Kim; Dinh Loc Duong; Young Hee Lee
Publication Date
2021-01
Journal
Physical Review B, v.103, no.1
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.Doping van der Waals layered semiconductors with magnetic atoms is a simple and effective approach to induce magnetism. However, investigation of the electrical properties of such two-dimensional semiconductors and the modulation of their magnetic order for spintronics is still lacking. Herein, we report a giant Zeeman shift from the spin-polarized state in tungsten diselenide (WSe2) doped with a small amount of vanadium (V) atoms (∼0.1%). The Zeeman shift was measured via resonant magnetotunneling spectroscopy with a vertical graphite/V-WSe2/graphite heterojunction. The p-type doping state near the valence band is substantially shifted under an external magnetic field by 7.8 meV/T, equivalent to a giant g factor of approximately 135, an order of magnitude higher than that of other two-dimensional magnetic semiconductors. The ferromagnetic order of the spin glass state and its long-range interaction are revealed by the remanence of magnetoresistance between the zero-field cooling and field-cooling processes as well as magnetoresistance hysteresis. The ferromagnetic glass order is fully established at 50 K, whereas the long-range interaction persists at higher temperatures of up to 300 K in V-doped WSe2 flakes with an approximate thickness of 5 nm. Our work sheds light on the magnetic nature of V-doped WSe2 semiconductors and paves the way for future spintronics based on two-dimensional van der Waals magnetic semiconductors.
URI
https://pr.ibs.re.kr/handle/8788114/9516
DOI
10.1103/PhysRevB.103.014441
ISSN
2469-9950
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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