THESIS
2007
x, 57 leaves : ill. (some col.) ; 30 cm
Abstract
The observation on “Zero-dc-Resistance State” (ZRS) in high mobility two-dimensional electron systems (2DES) in a perpendicular magnetic field and subjected to microwave (MW) radiation presented a surprise to the physics community. More recently a circular-polarization-dependent study of the MW photoconductivity revealed the failure of available theoretical models on ZRS in explaining the observed polarization immunity of the MW induced resistance oscillations. In this thesis, we propose that a spontaneous oscillatory mode of the center of mass (CM) of the whole electron fluid would occur to stabilize the system and minimize the polarization dependence of the oscillatory DC resistance. We investigate its effect quantitatively by building and solving a set of self-consistent equations go...[
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The observation on “Zero-dc-Resistance State” (ZRS) in high mobility two-dimensional electron systems (2DES) in a perpendicular magnetic field and subjected to microwave (MW) radiation presented a surprise to the physics community. More recently a circular-polarization-dependent study of the MW photoconductivity revealed the failure of available theoretical models on ZRS in explaining the observed polarization immunity of the MW induced resistance oscillations. In this thesis, we propose that a spontaneous oscillatory mode of the center of mass (CM) of the whole electron fluid would occur to stabilize the system and minimize the polarization dependence of the oscillatory DC resistance. We investigate its effect quantitatively by building and solving a set of self-consistent equations governing the behavior of MW-induced motion and the spontaneous mode and further examine how it affects the DC resistance. Based on analytic and numerical analysis, we find that the entrance of this spontaneous mode can solve the negative resistance (NR) problem and provides a plausible explanation for the observed ZRS and polarization immunity.
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