Gerhardts, R. and Weiss, Dieter and Wulf, U.
Magnetoresistance oscillations in a grid potential: Indication of a Hofstadter-type energy spectrum.
Physical Review B 43, pp. 5192-5195.
Other URL: http://prola.aps.org/abstract/PRB/v43/i6/p5192_1, http://prb.aps.org/
We present experimental and theoretical results on magnetoresistivity oscillations of high-mobility two-dimensional electron systems in a weak superlattice potential. Experimentally, the band conductivity of a sample with a holographically produced grid potential is shown to be considerably smaller than that of the same sample with a similar linear grating potential of the same lattice constant. This is explained by a magnetotransport theory with due consideration of collision broadening effects and the peculiar subband splitting of Landau levels resulting in a Hofstadter- type energy spectrum.