Abstract
We develop a microscopic model to explain the striking result of immunity to the sense of circularly polarized radiation of the photo-excited resistance oscillations in high-mobility 2D electron systems. Our model is based on the radiation-driven electron orbit model, previously developed to explain the photo-induced resistance oscillations and zero resistance states in these systems. According to it, the guiding center of the Landau states when irradiated by circularly polarized radiation performs a circular path driven by radiation. In principle, in an infinite sample, this path is different according to the the sense of circular polarization (left or right). However, the limited size of the sample with the essential role of the edges and the concurrent presence of the Hall electric field tend to quench the displacement of the driven guiding center making nearly equal both trajectories. In the end and in the presence of scattering, the longitudinal irradiated magnetoresistance turns out nearly the same irrespective of the sense of circular radiation.
Highlights
Microwave-induced resistance oscillations and zero resistance states[1,2] could be revealing a subtle novel form of coupling between radiation and matter
The available experimental evidence proves that these oscillations present some features that can be considered universal: they are periodic in B−1, present a 1/4 cycle phase shift in the oscillations minima[3], are sensitive to temperature (T)[4,5], present a non-linear increase with the radiation power (P)[6,7,8,9,10,11,12,13,14,15,16], are immune to the sense of circular polarization in the incident radiation[17], and other intriguing phenomena
In this article we present a microscopic theoretical approach on the effect of the sense of circularly polarized radiation on irradiated Rxx based on a previous theory, developed by the authors: the radiation-driven electron orbit[21,22,23,24,25]
Summary
We consider a high mobility 2DES in the x−y plane subjected to a static and perpendicular magnetic field, and a DC electric field (driving electric field) parallel to the x direction, Edc. We consider a high mobility 2DES in the x−y plane subjected to a static and perpendicular magnetic field, and a DC electric field (driving electric field) parallel to the x direction, Edc This system is irradiated with circularly polarized radiation, we initially consider for left-handed circular polarization, (Ex = Ey), the radiation electric field:
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