Abstract
We report on theoretical studies of recently obtained experimental results on microwave-induced resistance oscillations and zero resistance states in Hall bars with two occupied subbands. In these experiments, resistance presents a peculiar shape which appears to have a built-in interference effect not observed before. We apply the microwave-driven electron orbit model, which implies a radiation-driven oscillation of the two-dimensional electron system. Thus, we calculate different intra- and inter-subband electron scattering rates revealing different microwave-driven oscillations frequencies for the two electronic subbands. Calculated results are in good agreement with experiments.
Highlights
In the last decade, it was discovered that when a Hall bar (a 2DES with a uniform and perpendicular magnetic field (B) is irradiated with microwaves, some unexpected effects are revealed, deserving special attention from the condensed matter community: microwave-induced (MW) resistance oscillations (MIRO) and zero resistance states (ZRS) [1,2]
The main difference in the longitudinal magnetoresistance (Rxx) of a two-subband sample is the presence of magneto-intersubband oscillations (MISO) [17,18]
We theoretically study magnetoresistance of a Hall bar being illuminated with MW radiation when two electronic subbands participate in the transport
Summary
It was discovered that when a Hall bar (a 2DES with a uniform and perpendicular magnetic field (B) is irradiated with microwaves, some unexpected effects are revealed, deserving special attention from the condensed matter community: microwave-induced (MW) resistance oscillations (MIRO) and zero resistance states (ZRS) [1,2]. One of the most interesting setups, carried out recently, consists in using samples with two or three occupied subbands [15]. These samples are either based in a double-quantum-well structure or just one single but wide quantum well. The main difference in the longitudinal magnetoresistance (Rxx) of a two-subband sample is the presence of magneto-intersubband oscillations (MISO) [17,18]. These oscillations occur due to periodic modulation of the probability of transitions through elastic scattering between Landau levels of different subbands [19,20,21,22]. In the same experiment [15], it was observed that there is a peculiar Rxx profile with different features regarding the one-subband case [1,2] affecting only valleys and peaks of MIRO’s in a surprising regular way, deserving special attention
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