MAGNETOTRANSPORT THROUGH DISORDERED AND ANISOTROPIC ANTIDOT LATTICES IN GAAS ALXGA1-XAS HETEROSTRUCTURES/

We investigate the relation between commensurability oscillations and current how direction in lateral two-dimensional anisotropic antidot l attices. The anisotropy is introduced as one-directional fluctuation o r expansion of the lattice spacing. The fluctuation of the antidot loc ation suppresses the peaks of commensurability oscillations. The suppr ession is dominated by the fluctuation perpendicular to the current ho w direction. In one-directional expanded lattices, the peaks appear at the magnetic fields which correspond to the cyclotron motions with th e diameter of the periods perpendicular to the current. These results suggest that the commensurability oscillations are determined only by the period along the direction perpendicular to the current.