Mach-Zehnder interferometric device for spin filtering in a GaAsAlGaAs electron gas

Benjamin Santos, Ernesto Medina, Alexander López, Bertrand Berche

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2 Citas (Scopus)

Resumen

A spin filtering device using quantum spin interference is theoretically proposed in a GaAsAlGaAs electron gas that has both Rashba and Dresselhaus spin-orbit couplings. The device achieves polarized electron currents by separating spin up and spin down components without a magnetic field gradient. We find two broad spin filtering regimes, one where the interferometer has symmetrical arms, where a small magnetic flux is needed to achieve spin separation, and the other with asymmetric arms where the change in path length renders an extra phase emulating the effects of a magnetic field. We identify operating points for the device where optimal electron polarization is achieved within value ranges found in a 2D electron gas. Both device setups apply for arbitrary incoming electron polarization and operate at broad energy ranges within the incoming electron band.

Idioma originalInglés
Número de artículo114523
PublicaciónJournal of Applied Physics
Volumen110
N.º11
DOI
EstadoPublicada - 1 dic. 2011
Publicado de forma externa

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