Microwave-induced resistance oscillations in a back-gated GaAs quantum well

Abstract

We report on the effective mass measurements employing microwave-induced resistance oscillation in a tunable-density GaAs/AlGaAs quantum well. Our main result is a clear observation of the effective mass increase with decreasing density, in general agreement with earlier studies which investigated the density dependence of the effective mass employing Shubnikov-de Haas oscillations. This finding provides further evidence that microwave-induced resistance oscillations are sensitive to electron-electron interactions and offer a convenient and accurate way to obtain the effective mass.

Microwave response of interacting oxide two-dimensional electron systems

“…These probe the electronic system in the opposite limit of large k. When a sufficient number of MIRO harmonics can be resolved in experiment [33], the MIRO mass can be determined with high precision by fitting simultaneously the positions of both MIRO minima and maxima to = N ± 1/4 with integer N (see also Refs. [8][9][10]). For the sample in Fig.…”

“…Recently, oscillatory magnetotransport features that appear under incident microwave radiation, referred to as microwave-induced resistance oscillations or MIRO [7], have been advanced as an alternative tool for obtaining the interaction-dependent effective mass [8][9][10][11]. This method has mainly been deployed in the weakly interacting regime, where r s = E C /E F < 2 [8][9][10]. Recently, a different region of parameter space where Coulomb interactions prevail and r s spans values from 3 to 6 has been accessed [11].…”

Microwave response of interacting oxide two-dimensional electron systems

“…1 Recently, oscillatory magnetotransport features that appear under incident microwave radiation, referred to as microwave induced resistance oscillations or MIRO, 7 have been advanced as an alterna-tive tool for obtaining the interaction-dependent effective mass. [8][9][10][11] This method has mainly been deployed in the weakly-interacting regime, where r s = E C /E F < 2. [8][9][10] Recently a different region of parameter space where Coulomb interactions prevail and r s spans values from 3 to 6 has been accessed.…”

Evidence for non-Markovian electron dynamics in the microwave absorption of a two-dimensional electron system

“…The appearance of different effective masses is in accord with previous reports exploiting different transport phenomena to extract the mass. For instance, the effective mass obtained from the periodicity of the microwave-induced resistance oscillations (MIRO) is approximately 0.06 m e for our carrier densities [36][37][38]. A higher effective mass was obtained from the position of a narrow magnetoresistance spike at the second CR harmonic [22,39].…”