Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-05-19
Phys. Rev. Lett. 96, 236804 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.96.236804
We explore experimentally bichromatic (frequencies $\omega_1$ and $\omega _2$) photoresistance of a two-dimensional electron system in the regimes of microwave-induced resistance oscillations and zero-resistance states. We find bichromatic resistance to be well described by a superposition of $\omega_1$ and $\omega_2$ components, provided that both monochromatic resistances are positive. This relation holds even when the oscillation amplitudes are small and one could expect additive contributions from monochromatic photoresistances. In contrast, whenever a zero-resistance state is formed by one of the frequencies, such superposition relation breaks down and the bichromatic resistance is strongly suppressed.
Du Rui-Rui
Pfeiffer Loren N.
West Ken. W.
Zudov M. A.
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