title: Circularly polarized photoluminescence as a probe of density of states in GaAs/AlGaAs quantum Hall bilayers.
abstract: Polarized magnetophotoluminescence is employed to study the energies and occupancies of four lowest Landau levels in a couple quantum Hall GaAs/AlGaAs double quantum well. As a result, a magnetic field-induced redistribution of charge over the Landau levels manifesting to the continuous formation of the charge density wave and direct evidence for the symmetric-antisymmetric gap shrinkage at ν=3 are found. The observed interlayer charge exchange causes depolarization of the ferromagnetic ground state.
authors.affiliation: Instituto de Fisica de São Carlos, Universidade de São Paulo, 13560-970 Sao Carlos, São Paulo, Brazil.
authors.forename: Yu A
authors.initials: YA
authors.lastname: Pusep
authors.forename: L
authors.initials: L
authors.lastname: Fernandes dos Santos
authors.forename: G M
authors.initials: GM
authors.lastname: Gusev
authors.forename: D
authors.initials: D
authors.lastname: Smirnov
authors.forename: A K
authors.initials: AK
authors.lastname: Bakarov