title: Circular polarization in a non-magnetic resonant tunneling device.
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.
authors.affiliation: Physics Department, Federal University of São Carlos, São Carlos, Brazil. yara@df.ufscar.br.
authors.forename: Lara F
authors.initials: LF
authors.lastname: Dos Santos
authors.forename: Yara Galvão
authors.initials: YG
authors.lastname: Gobato
authors.forename: Márcio D
authors.initials: MD
authors.lastname: Teodoro
authors.forename: Victor
authors.initials: V
authors.lastname: Lopez-Richard
authors.forename: Gilmar E
authors.initials: GE
authors.lastname: Marques
authors.forename: Maria Jsp
authors.initials: MJ
authors.lastname: Brasil
authors.forename: Milan
authors.initials: M
authors.lastname: Orlita
authors.forename: Jan
authors.initials: J
authors.lastname: Kunc
authors.forename: Duncan K
authors.initials: DK
authors.lastname: Maude
authors.forename: Mohamed
authors.initials: M
authors.lastname: Henini
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Airey