title: High-frequency magneto-oscillations in GaAs/AlGaAs quantum wells.
abstract: We have observed very high-frequency, highly reproducible magneto-oscillations in modulation doped GaAs/AlGaAs quantum well structures. The oscillations are periodic in an inverse magnetic field (1/B) and their amplitude increases with temperature up to T approximately 700 mK. Being initially most pronounced around the filling factor nu=1/2, they move towards lower nu with increasing T. Front and back-gating data imply that these oscillations require a coupling to a parallel conducting layer. A comparison with existing oscillation models renders no explanation.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Y-W
authors.initials: YW
authors.lastname: Tan
authors.forename: H L
authors.initials: HL
authors.lastname: Stormer
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West