Orientation of the stripe formed by two-dimensional electrons at high Landau levels

The effect of periodic potential on the stripe phase realized at high Landa u levels is investigated by the Hartree-Fock approximation. The period of t he potential is chosen to be two to six times the fundamental period of the stripe phase. It is found that the stripe aligns perpendicularly to the ex ternal potential in contrast to a naive expectation and hydrodynamic theory . Charge modulation towards the Wigner crystallization along the stripe is essential for the occurrence of the present unexpected new result.