TRANSPORT-PROPERTIES IN ARTIFICIAL LATERAL SUPERLATTICE

We investigate commensurate oscillations in ordered and disordered art ificial lateral superlattice (ALS) systems, in which the anti-dots are arranged in a square or triangular lattice. With increasing disorder of the anti-dot location, the peaks of the commensurate oscillations f ade out. The peak heights are more strongly affected by the disorder a long perpendicular direction to the current than by that along the par allel direction. In the square ALS system, the commensurate oscillatio ns seem to be determined principally by the order along the perpendicu lar direction to the current, while in the triangular ALS system, the commensurate oscillations would be determined by the nearest neighbor distance between anti-dots and the order along the perpendicular direc tion. In addition, the appearance of each peak is determined by the ra tio of the anti-dot diameter to the ALS period. The weak localization effect in very low magnetic field and the strongly temperature depende nt conductance in the absence of magnetic field are also observed in t he ALS systems.