title: Spin injection in n-type resonant tunneling diodes.
abstract: We have studied the polarized resolved photoluminescence of n-type GaAs/AlAs/GaAlAs resonant tunneling diodes under magnetic field parallel to the tunnel current. Under resonant tunneling conditions, we have observed two emission lines attributed to neutral (X) and negatively charged excitons (X-). We have observed a voltage-controlled circular polarization degree from the quantum well emission for both lines, with values up to -88% at 15 T at low voltages which are ascribed to an efficient spin injection from the 2D gases formed at the accumulation layers.
authors.affiliation: Physics Department, Federal University of São Carlos, São Carlos 13,565-905, Brazil. yara@df.ufscar.br.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Orsi Gordo
authors.forename: Leonilson Ks
authors.initials: LK
authors.lastname: Herval
authors.forename: Helder Va
authors.initials: HV
authors.lastname: Galeti
authors.forename: Yara Galvão
authors.initials: YG
authors.lastname: Gobato
authors.forename: Maria Jsp
authors.initials: MJ
authors.lastname: Brasil
authors.forename: Gilmar E
authors.initials: GE
authors.lastname: Marques
authors.forename: Mohamed
authors.initials: M
authors.lastname: Henini
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Airey