Comparative study of microwave radiation-induced magnetoresistive oscillations induced by circularly- and linearly- polarized photo-excitation
نویسندگان
چکیده
A comparative study of the radiation-induced magnetoresistance oscillations in the high mobility GaAs/AlGaAs heterostructure two dimensional electron system (2DES) under linearly- and circularly- polarized microwave excitation indicates a profound difference in the response observed upon rotating the microwave launcher for the two cases, although circularly polarized microwave radiation induced magnetoresistance oscillations observed at low magnetic fields are similar to the oscillations observed with linearly polarized radiation. For the linearly polarized radiation, the magnetoresistive response is a strong sinusoidal function of the launcher rotation (or linear polarization) angle, θ. For circularly polarized radiation, the oscillatory magnetoresistive response is hardly sensitive to θ.
منابع مشابه
The influence of microwave radiation on the state of chromatin in human cells
Isolated human buccal epithelium cells were irradiated by microwaves of frequency f=35 GHz and surface power density E=30 μW/cm. The state of chromatin in human cells was determined by methods of light and electron microscopy. The state of cell membranes was evaluated by the method of vital indigo carmine staining. The microwave-induced condensation of chromatin in human cells was revealed. Lef...
متن کامل7 A ug 2 00 4 Low - frequency instability of circularly polarized microwave - pulsed - field - produced plasmas ∗
The plasma produced by a high-power pulsed circularly polarized microwave field which is much weaker than the atomic fields is investigated in the non-relativistic limit. It is shown that the resulting electron distribution function is non-equilibrium and anisotropic. Furthermore, the dispersion equations derived to study and analyze low-frequency ion oscillations. It is shown an instability ma...
متن کاملMicrowave birefringent metamaterials for polarization conversion based on spoof surface plasmon polariton modes
We propose the design of wideband birefringent metamaterials based on spoof surface plasmon polaritons (SSPPs). Spatial k-dispersion design of SSPP modes in metamaterials is adopted to achieve high-efficiency transmission of electromagnetic waves through the metamaterial layer. By anisotropic design, the transmission phase accumulation in metamaterials can be independently modulated for x- and ...
متن کاملA comparative study on the increased radioresistance to lethal doses of gamma rays after exposure to microwave radiation and oral intake of flaxseed oil
Background: Mobile phones, use electromagnetic radiation in the microwave range. On the other hand, there is only one report on radioprotective effects of flaxseed oil. The aim of this study was to investigate the effect of irradiation of rats with microwaves and/or treatment with flaxseed oil on the induction of adaptive response to a subsequent lethal dose (LD) of gamma rays. Materia...
متن کامل2 7 Ja n 20 05 Photo - induced pure spin currents in quantum wells
As is well known the absorption of circularly polarized light in semiconductors results in optical orientation of electron spins and helicity-dependent electric photocurrent, and the absorption of linearly polarized light is accompanied by optical alignment of electron momenta. Here we show that the absorption of unpolarized light in a quantum well (QW) leads to generation of a pure spin curren...
متن کامل