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Circular polarization in a non-magnetic resonant tunneling device

Author(s): dos Santos Lara | Gobato Yara | Teodoro Márcio | Lopez-Richard Victor | Marques Gilmar | Brasil Maria | Orlita Milan | Kunc Jan | Maude Duncan | Henini Mohamed | Airey Robert

Journal: Nanoscale Research Letters ISSN 1931-7573
Volume: 6; Issue: 1; Start page: 101; Date: 2011;
Original page

ABSTRACT
Abstract We have investigated the polarization-resolved photoluminescence (PL) in an asymmetric n-type GaAs/AlAs/GaAlAs resonant tunneling diode under magnetic field parallel to the tunnel current. The quantum well (QW) PL presents strong circular polarization (values up to -70% at 19 T). The optical emission from GaAs contact layers shows evidence of highly spin-polarized two-dimensional electron and hole gases which affects the spin polarization of carriers in the QW. However, the circular polarization degree in the QW also depends on various other parameters, including the g-factors of the different layers, the density of carriers along the structure, and the Zeeman and Rashba effects.