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Magnetoresistance anisotropy in Si /SiGe in tilted magnetic fields: experimental evidence for a stripe-phase
U Zeitler1, H W Schumacher, A G Jansen
1Institut für Festkörperphysik, Universität Hannover, Germany. zeitler@nano.uni-hannover.de
Physical Review Letters
|February 15, 2001
Abstract:
We observe pronounced transport anisotropies in magnetotransport experiments performed in the two-dimensional electron system of a Si/SiGe heterostructure. They occur when an in-plane field is used to tune two Landau levels with opposite spin to energetic coincidence. The observed anisotropies disappear drastically for temperatures above 1 K. We propose that our experimental findings may be caused by the formation of a unidirectional stripe phase oriented perpendicular to the in-plane field.