Comparative study of microwave radiation-induced magnetoresistive oscillations induced by circularly- and linearly- polarized photo-excitation

摘要

A comparative study of the radiation-induced magnetoresistance oscillationsin the high mobility GaAs/AlGaAs heterostructure two dimensional electronsystem (2DES) under linearly- and circularlypolarized microwave excitationindicates a profound difference in the response observed upon rotating themicrowave launcher for the two cases, although circularly polarized microwaveradiation induced magnetoresistance oscillations observed at low magneticfields are similar to the oscillations observed with linearly polarizedradiation. For the linearly polarized radiation, the magnetoresistive responseis a strong sinusoidal function of the launcher rotation (or linearpolarization) angle, {\theta}. For circularly polarized radiation, theoscillatory magnetoresistive response is hardly sensitive to {\theta}.