Reorientation of Anisotropy in a Square Well Quantum Hall Sample
W. Pan, T. Jungwirth, H. L. Stormer, D. C. Tsui, A. H. MacDonald, S. M. Girvin, L. Smrcka, L. N. Pfeiffer, K. W. Baldwin, K. W. West
Abstract
We have measured magnetotransport at half-filled high Landau levels in a quantum well with two occupied electric subbands. We find resistivities that are isotropic in perpendicular magnetic field but become strongly anisotropic at ν = 9/2 and 11/2 on tilting the field. The anisotropy appears at an in-plane field, Bip 2.5T, with the easy-current direction parallel to Bip but rotates by 90 at Bip 10T and points now in the same direction as in single-subband samples. This complex behavior is in quantitative agreement with theoretical calculations based on a unidirectional charge density wave state model.
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