Multiple and virtual photon processes in radiation-induced magnetoresistance oscillations in two-dimensional electron systems

X. L. Lei, S. Y. Liu

Published 2006-01-27, updated 2006-05-26Version 2

Recently discovered new structures and zero-resistance states outside the well-known oscillations are demonstrated to arise from multiphoton assisted processes, by a detailed analysis of microwave photoresistance in two-dimensional electron systems under enhanced radiation. The concomitant resistance dropping and peak narrowing observed in the experiments are also reproduced. We show that the radiation-induced suppression of average resistance comes from virtual photon effect and exists throughout the whole magnetic field range.