Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 24, Pages 5592-5595Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.5592
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Experiments on high-quality GaAs (311)A two-dimensional holes at low temperatures reveal a remarkable dependence of the magnetoresistance, measured with an in-plant magnetic field (B), on the direction of B relative to both the crystal axes and the current direction. The magnetoresistance features, and in particular the value of B above which the resistivity exhibits an insulating behavior, depend on the orientation of B. To explain the data, the anisotropic band structure of the holes and a repopulation of the spin subbands in the presence of B, as well as the coupling of the orbital motion to B, need to be taken into account.
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