title: Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field.
abstract: By measuring the angles at which the Landau levels overlap in tilted magnetic fields (the coincidence method), we determine the splitting of the conduction-band valleys in high-mobility two-dimensional electrons confined to AlAs quantum wells. The data reveal that, while the valleys are nearly degenerate in the absence of magnetic field, they split as a function of perpendicular magnetic field. The splitting appears to depend primarily on the magnitude of the perpendicular component of the magnetic field, suggesting electron-electron interaction as its origin.
authors.affiliation: Department of Electrical Engineering, Princeton University, New Jersey 08544, USA.
authors.forename: Y P
authors.initials: YP
authors.lastname: Shkolnikov
authors.forename: E P
authors.initials: EP
authors.lastname: De Poortere
authors.forename: E
authors.initials: E
authors.lastname: Tutuc
authors.forename: M
authors.initials: M
authors.lastname: Shayegan