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

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

2006-05-22

arxiv.org/abs/cond-mat/0605521v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.235322

We analyze the magnetoresistance $R_{xx}$ oscillations in high-mobility two-dimensional electron systems induced by the combined driving of two radiation fields of frequency $\omega_1$ and $\omega_2$, based on the balance-equation approach to magnetotransport for high-carrier-density systems in Faraday geometry. It is shown that under bichromatic irradiation of $\omega_2\sim 1.5 \omega_1$, most of the characterstic peak-valley pairs in the curve of $R_{xx}$ versus magnetic field in the case of monochromatic irradiation of either $\omega_1$ or $\omega_2$ disappear, except the one around $\omega_1/\omega_c\sim 2$ or $\omega_2/\omega_c\sim 3$. $R_{xx}$ oscillations show up mainly as new peak-valley structures around other positions related to multiple photon processes of mixing frequencies $\omega_1+\omega_2$, $\omega_2-\omega_1$, etc. Many minima of these resistance peak-valley pairs can descend down to negative with enhancing radiation strength, indicating the possible bichromaticzero-resistance states.

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