High-field spin-polarization transition in the Landau bands of quasi-2D electron gases with strong lateral modulation
Laboratoire de Microstructures et de Microélectronique (L2M), CNRS, B.P. 107, 92225 Bagneux Cedex, France
Accepted: 10 March 1997
2D electron gases, imbedded in a 1D lateral potential (in ), made by a periodic modulation in alloy composition, are obtained by organized epitaxy on vicinal surfaces. The exchange enhancement of the Landau level spin splitting is inhibited up to a strong magnetic field ( here). Low-temperature magneto-transport data revealing this effect cannot be explained by disorder but are fully consistent with the large potential gradients associated with the modulation amplitude.
PACS: 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) / 71.70.Gm – Exchange interactions / 73.61.Ey – III-V semiconductors
© EDP Sciences, 1997