R. G. Mani

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The observation of vanishing electrical resistance in condensed matter has led to the discovery of new phenomena such as, for example, superconductivity, where a zero-resistance state can be detected in a metal below a transition temperature T(c) (ref. 1). More recently, quantum Hall effects were discovered from investigations of zero-resistance states at(More)
We examine the microwave-photoexcited magnetoresistance oscillations in a tilted magnetic field in the high-mobility two-dimensional electron system ͑2DES͒. In analogy to the 2D Shubnikov–de Haas effect, the characteristic field B f and the period of the radiation-induced magnetoresistance oscillations appear dependent upon the component of the applied(More)
High mobility two-dimensional electron systems exhibit vanishing resistance over broad magnetic field intervals upon excitation with microwaves, with a characteristic reduction of the resistance with increasing radiation intensity at the resistance minima. Here, we report experimental results examining the voltage-current characteristics, and the resistance(More)
This thesis consists of two parts. The first part considers the effect of microwave radiation on magnetotransport in high quality GaAs/AlGaAs heterostructure two dimensional electron systems. The effect of microwave (MW) radiation on electron temperature was studied by investigating the amplitude of the Shubnikov de Haas (SdH) oscillations in a regime where(More)
Phase study of oscillatory resistances in microwave-irradiated-and dark-GaAs/AlGaAs devices: Indications of a new class of integral quantum Hall effect We report the experimental results from a dark study and a photo-excited study of the high mobility GaAs/AlGaAs system at large filling factors, ν. At large-ν, the dark study indicates several distinct phase(More)
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