Using a two-axis magnet, we have studied experimentally the influence of a parallel magnetic field (B∕∕) on microwave-induced resistance oscillations (MIROs) and zero-resistance states (ZRS) previously discovered in a high-mobility two-dimensional electron system. We have observed a strong suppression of MIRO/ZRS by a modest B∕∕~10.3em0exT. In Hall bar samples, magnetoplasmon resonance (MPR) has also been observed concurrently with the MIRO/ZRS. In contrast to the suppression of MIRO/ZRS, the MPR peak is apparently enhanced by B∕∕. These findings cannot be explained by a simple modification of single-particle energy spectrum and/or scattering parameters by B∕∕.
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Yang et al. (2006) studied this question.
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