The theory of weak localization is presented for quasi-2D systems where several sub- bands of size quantization are occupied. The weak-localization correction to conductivity is shown to depend strongly on the level concentration ratio and intersubband scattering intensity. Specifically at the comparable level occupations and equal relaxation times the conductivity correction of the m-subband system decreases in m times when transiting from the isolated levels to the high-intensive intersubband scattering ...
The theory of the Shubnikov-de Haas effect is presented for quasi-2D systems when several subbands of size quantization are occupied. The temperature behavior of oscillation spectrum is considered. It is shown that the main harmonics with frequencies defined by subband fillings damp exponentially and the non-damping oscillations with differential frequencies proportional to energy gaps between subbands manifest themselves. They are harmonics, which became dominating at the following increasing of temperature. ...
Macro- and micro-photoluminescence (PL) spectroscopy is applied to investigate exciton localization in cubic CdS/ZnSe type-II superlattices (SL) in the temperature range between 5 K and 35 K. The non-monotonous shift of the macro-PL maximum with increasing temperature reveals the kinetic contribution of acoustic-phonon-assisted exciton hopping processes. The kinetic theory of localized excitons has been generalized from zero to finite temperatures allowing for exciton hopping from low-energy to high-energy localized sites ...
Shubnikov-de Haas conductivity oscillations are calculated taking into account intensive intersubband transitions between levels of size quantizatition in a quantum well and compared with anomalous magnetoresistance under weak localization conditions.
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