Sub-linear radiation power dependence of photo-excited resistance oscillations in two-dimensional electron systems

Details Sub-linear radiation power dependence of photo-excited resistance oscillations in two-dimensional electron systems Sub-linear radiation power dependence of photo-excited resistance oscillations in two-dimensional electron systems

2010-11-23

arxiv.org/abs/1011.5251v1

Physical Review B. 82, 205321, 2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

We find that the amplitude of the $R_{xx}$ radiation-induced magnetoresistance oscillations in GaAs/AlGaAs system grows nonlinearly as $A \propto P^{\alpha}$ where $A$ is the amplitude and the exponent $\alpha < 1$. %, with $\alpha \rightarrow 1/2$ in %the low temperature limit. This striking result can be explained with the radiation-driven electron orbits model, which suggests that the amplitude of resistance oscillations depends linearly on the radiation electric field, and therefore on the square root of the power, $P$. We also study how this sub-linear power law varies with lattice temperature and radiation frequency.

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