Density Induced Interchange of Anisotropy Axes at Half-Filled High Landau Levels

Details Density Induced Interchange of Anisotropy Axes at Half-Filled High Landau Levels Density Induced Interchange of Anisotropy Axes at Half-Filled High Landau Levels

2002-03-09

arxiv.org/abs/cond-mat/0203203v1

PRL, 88, 116803 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

1 revtex file, 3 eps figures

Scientific paper

10.1103/PhysRevLett.88.116803

We observe density induced 90$^{\circ}$ rotations of the anisotropy axes in transport measurements at half-filled high Landau levels in the two dimensional electron system, where stripe states are proposed ($\nu$=9/2, 11/2, etc). Using a field effect transistor, we find the transition density to be $2.9\times10^{11}$cm$^{-2}$ at $\nu$=9/2. Hysteresis is observed in the vicinity of the transition. We construct a phase boundary in the filling factor-magnetic field plane in the regime $4.4<\nu<4.6$. An in-plane magnetic field applied along either anisotropy axis always stabilizes the low density orientation of the stripes.

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