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Field-tilt anisotropy energy in quantum Hall stripe states

1999; American Physical Society; Volume: 60; Issue: 23 Linguagem: Inglês

10.1103/physrevb.60.15574

1095-3795

T. Jungwirth, A. H. MacDonald, L. Smrčka, S. M. Girvin,

Semiconductor materials and devices

Recently reported giant anisotropy in the longitudinal resistivity of a two-dimensional (2D) electron system with valence Landau level index $N>~2$ has been interpreted as a signal of unidirectional charge density wave (UCDW) ground states. We report on detailed Hartree-Fock calculations of the UCDW orientation energy induced by a tilted magnetic field. We find that for current experimental samples, stripes are oriented perpendicular to the in-plane field, consistent with experiment. For wider 2D electron systems, we predict tilt-induced stripe states with variable anisotropy energy sign.