The polarization dependence of the low field microwave photoconductivity and absorption of a two-dimensional electron system has been investigated in a quasi-optical setup in which linear and any circular polarization can be produced in-situ. The microwave induced resistance oscillations and the zero resistance regions are notedly immune to the sense of circular polarization. This observation is discrepant with a number of proposed theories. Deviations only occur near the cyclotron resonance absorption where an unprecedented large resistance response is observed.
@article{arxiv.cond-mat/0505183,
title = {Circular polarization dependent study of the microwave photoconductivity in a two-dimensional electron system},
author = {J. H. Smet and B. Gorshunov and C. Jiang and L. Pfeiffer and K. West and V. Umanksy and M. Dressel and R. Meisels and F. Kuchar and K. von Klitzing},
journal= {arXiv preprint arXiv:cond-mat/0505183},
year = {2009}
}