Abstract
We have observed anisotropic states of two-dimensional hole systems (2DHS) in higher Landau levels which are analogous to those found in 2D electron systems (2DES), the so-called stripe phase. Application of in-plane magnetic field along the hard (high resistance) direction stabilizes the anisotropic state, while that along the easy axis hardly affect the state. This is in contrast to the corresponding 2DES case where the stripe is easily reoriented by an in-plane magnetic field, and suggests that the built-in symmetry-breaking cause which favors a particular stripe orientation acts more strongly in 2DHS than in 2DES. We discuss the possible origin of the orientational pinning.
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