Shift of geometrical resonances in a periodical lattice of antidots in tilted magnetic field

The behavior of geometrical resonances in a two-dimensional electron gas wi th a square lattice of antidots leading to the commensurability oscillation s of magnetoresistance was studied in tilted magnetic fields. It was found that application of a strong in-plain magnetic field H, shifts the position of the main commensurability peak to the lower perpendicular magnetic fiel ds H-z(peak). At sufficiently high in-plain magnetic fields H-x similar to 10 T the relative shift reaches 12%. The results obtained are explained by the change of the electron energy spectrum at strong H,, resulting in the c hange of effective mass of the electron in the gamma direction. (C) 2001 El sevier Science B.V. All rights reserved.