Radiation-induced magnetoresistance oscillations in two-dimensional electron systems under bichromatic irradiation

الأصل · EN

We analyze the magnetoresistance Rxx oscillations in high-mobility two-dimensional electron systems induced by the combined driving of two radiation fields of frequency ω₁ and ω₂, based on the balance-equation approach to magnetotransport for high-carrier-density systems in Faraday geometry. It is shown that under bichromatic irradiation of ω₂ 1.5 ω₁, most of the characterstic peak-valley pairs in the curve of Rxx versus magnetic field in the case of monochromatic irradiation of either ω₁ or ω₂ disappear, except the one around ω₁/ωc 2 or ω₂/ωc 3. Rxx oscillations show up mainly as new peak-valley structures around other positions related to multiple photon processes of mixing frequencies ω₁+ω₂, ω₂-ω₁, etc. Many minima of these resistance peak-valley pairs can descend down to negative with enhancing radiation strength, indicating the possible bichromaticzero-resistance states.