Nonlocal resistance of 2D electron gas in antidot lattice in quantum Hall effect regime

Abstract

Nonlocal resistance of a two-dimensional electron gas (2DEG) with a square lattice of antidots was experimentally investigated for the first time in comparison with unpatterned 2DEG. The nonlocal resistance of both the antidot lattice and the unpatterned 2DEG has maxima when the Fermi energy coincides with Landau levels, and the value of the nonlocal resistance in the maxima is a nonmonotonous function of the Landau level number. In contrast to the case of unpatterned 2DEG, this value for the case of antidot lattice has strong temperature dependence that can be attributed to the electron–phonon spin flip scattering at the boundaries of antidots.