Nonlocal Spin Dynamics in the Crossover from Diffusive to Ballistic Transport
Vila Tusell, Marc (Institut Català de Nanociència i Nanotecnologia)
Garcia, José H. (Institut Català de Nanociència i Nanotecnologia)
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Power, Stephen R. (Institut Català de Nanociència i Nanotecnologia)
Groth, Christoph W. (Université Grenoble Alpes)
Waintal, Xavier (Université Grenoble Alpes)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Data:	2020
Resum:	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.
Ajuts:	European Commission 785219 Ministerio de Economía y Competitividad SEV-2017-0706
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Ballistic transports ; Fabrication technique ; Nonlocal spin valves ; Quantum simulations ; Spin manipulation ; Spin-diffusion length ; Theoretical framework ; Two-dimensional materials
Publicat a:	Physical review letters, Vol. 124, Issue 19 (May 2020) , art. 196602, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.124.196602

Postprint 7 p, 2.2 MB

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