Magnetoresistance anisotropy in Si /SiGe in tilted magnetic fields: experimental evidence for a stripe-phase formation.
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.
Zeitler
U
U
Institut für Festkörperphysik, Universität Hannover, Germany. zeitler@nano.uni-hannover.de
Schumacher
H W
HW
Jansen
A G
AG
Haug
R J
RJ