期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.196602
关键词
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资金
- La Caixa Foundation
- Irish Research Council under the Laureate awards programme
- ANR GRANSPORT
- European Union Horizon 2020 research and innovation programme [785219]
- CERCA Programme/Generalitat de Catalunya
- Severo Ochoa program from Spanish MINECO [SEV-2017-0706]
Improved fabrication techniques have enabled the possibility of ballistic transport and unprecedented spin manipulation in ultraclean graphene devices. Spin transport in graphene is typically probed in a nonlocal spin valve and is analyzed using spin diffusion theory, but this theory is not necessarily applicable when charge transport becomes ballistic or when the spin diffusion length is exceptionally long. Here, we study these regimes by performing quantum simulations of graphene nonlocal spin valves. We find that conventional spin diffusion theory fails to capture the crossover to the ballistic regime as well as the limit of long spin diffusion length. We show that the latter can be described by an extension of the current theoretical framework. Finally, by covering the whole range of spin dynamics, our study opens a new perspective to predict and scrutinize spin transport in graphene and other two-dimensional material-based ultraclean devices.
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