期刊
2D MATERIALS
卷 9, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2053-1583/ac3887
关键词
transition metal dichalcogenides; trions; magnetic order; valleytronics; photoluminescence
资金
- Ministry of Education and Science of the Russian Federation [075-15-2021-589]
- Russian Science Foundation [19-72-00146]
- Government of the Russian Federation
- Russian Foundation for Basic Research (RFBR) [21-52-12038]
- RSF [21-12-00316]
- Russian Science Foundation [21-12-00316, 19-72-00146] Funding Source: Russian Science Foundation
Interfacing atomically thin van der Waals semiconductors with magnetic substrates provides additional control on their intrinsic valley degree of freedom. The results of this study establish monolayer MoSe2 interfaced with ferrimagnetic bismuth iron garnet as a promising system for valley control of charged excitons.
Interfacing atomically thin van der Waals semiconductors with magnetic substrates enables additional control on their intrinsic valley degree of freedom and provides a promising platform for the development of novel valleytronic devices for information processing and storage. Here we study circularly polarized photoluminescence in heterostructures of monolayer MoSe2 and thin films of ferrimagnetic bismuth iron garnet (BIG). We observe strong emission from charged excitons with circular polarization opposite to that of the pump and demonstrate contrasting response to left and right circularly polarized excitation, associated with finite out-of-plane magnetization in the substrate. We propose a theoretical model accounting for magnetization-induced imbalance of charge carriers in the two valleys of MoSe2, as well as for valley-switching scattering from B to A excitons and fast formation of trions with extended valley relaxation times, which shows excellent agreement with the experimental data. Our results establish monolayer MoSe2 interfaced with BIG as a promising system for valley control of charged excitons.
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