ON THE MECHANISM OF COMMENSURABILITY OSCILLATIONS IN ANISOTROPIC ANTIDOT LATTICES

We investigate the transport properties in various antidot lattices. I t is found that the fundamental peak on resistivity is determined by t he conductivity perpendicular to the current flow direction in the cas e of smaller diagonal component of conductivity tensor than the off-di agonal one. Moreover, the peaks of conductivity are explained by the r unaway trajectory, on which the electrons diffuse along the antidot ar ray like as skipping over the antidots when the cyclotron diameter of electron corresponds to the antidot period, and the conductivity along the antidot period is enhanced. This is the origin of the fundamental peak in the commensurability oscillations.