Paassen, A. and Zrenner, Artur and Efros, A. L. and Stopa, M. and Frankenberger, J. and Bichler, Max and Wegscheider, Werner
Direct Observation of Hole Edge Channels in a Two Dimensional Electron Gas.
Physical Review Letters 83 (15), pp. 3033-3036.
We report the direct optical observation of confinement and transport of minority holes in a two dimensional electron gas. In spatially resolved magneto-optical experiments we observe hole confinement at the edge of a two dimensional electron gas and hole transport in edge channels. In a theoretical analysis we show that a repulsive edge potential for holes at the boundary of a two dimensional electron gas is caused by a polaron effect.