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Title: Far out-of-equilibrium spin populations trigger giant spin injection into atomically thin MoS2
Authors: Cheng, Liang
Wang, Xinbo
Yang, Weifeng
Chai, Jianwei
Yang, Ming
Chen, Mengji
Wu, Yang
Chen, Xiaoxuan
Chi, Dongzhi
Goh, Johnson Kuan Eng
Zhu, Jian-Xin
Sun, Handong
Wang, Shijie
Song, Justin Chien Wen
Battiato, Marco
Yang, Hyunsoo
Chia, Elbert Ee Min
Keywords: Science::Physics
Issue Date: 2019
Source: Cheng, L., Wang, X., Yang, W., Chai, J., Yang, M., Chen, M., . . . Chia, E. E. M. (2019). Far out-of-equilibrium spin populations trigger giant spin injection into atomically thin MoS2. Nature Physics, 15(4), 347-351. doi:10.1038/s41567-018-0406-3
Journal: Nature Physics
Abstract: Injecting spins from ferromagnetic metals into semiconductors efficiently is a crucial step towards the seamless integration of charge- and spin-information processing in a single device1,2. However, efficient spin injection into semiconductors has remained an elusive challenge even after almost three decades of major scientific effort3,4,5, due to, for example, the extremely low injection efficiencies originating from impedance mismatch1,2,5,6, or technological challenges originating from stability and the costs of the approaches7,8,9,10,11,12. We show here that, by utilizing the strongly out-of-equilibrium nature of subpicosecond spin-current pulses, we can obtain a massive spin transfer even across a bare ferromagnet/semiconductor interface. We demonstrate this by producing ultrashort spin-polarized current pulses in Co and injecting them into monolayer MoS2, a two-dimensional semiconductor. The MoS2 layer acts both as the receiver of the spin injection and as a selective converter of the spin current into a charge current, whose terahertz emission is then measured. Strikingly, we measure a giant spin current, orders of magnitude larger than typical injected spin-current densities using currently available techniques. Our result demonstrates that technologically relevant spin currents do not require the very strong excitations typically associated with femtosecond lasers. Rather, they can be driven by ultralow-intensity laser pulses, finally enabling ultrashort spin-current pulses to be a technologically viable information carrier for terahertz spintronics.
ISSN: 1745-2473
DOI: 10.1038/s41567-018-0406-3
Rights: © 2019 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This paper was published in Nature Physics and is made available with permission of The Author(s), under exclusive licence to Springer Nature Limited
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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