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

Nonlocal resistance of a two-dimensional electron gas (2DEG) with a square lattice of antidots was experimentally investigated for the first time in c omparison with unpatterned 2DEG. The nonlocal resistance of both the antido t lattice and the unpatterned 2DEG has maxima when the Fermi energy coincid es with Landau levels, and the value of the nonlocal resistance in the maxi ma is a nonmonotonous function of the Landau level number. In contrast to t he case of unpatterned 2DEG, this value for the case of antidot lattice has strong temperature dependence that can be attributed to the electron-phono n spin flip scattering at the boundaries of antidots. (C) 2001 Elsevier Sci ence B.V. All rights reserved.