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The mechanism of cyclotron resonance line splitting in the InAs/GaSb heterostructure in an inclined magnetic field has been studied experimentally and theoretically. It is shown that the admixing of electron and hole states leads to anticrossing of the Landau levels and, hence, to splitting of the cyclotron resonance line. In the case of an inclined magnetic field, the splitting is not observed, which is explained by the suppression of the admixing of electron and hole states due to the occurrence of an additional barrier for electrons and holes given a longitudinal magnetic field component. © 2002 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

A new mechanism of current-induced cooling of heterostructures is proposed and studied. As an example, a structure with two quantum wells was taken to determine the conditions under which electric current can flow in the situation where electrons and holes transfer from one well to another via indirect phonon-assisted tunneling. It is shown that this system can be used to create an inverse electron and hole population and simultaneously cool the laser active region by injection current. The universal relation is obtained according to which the cooling temperature of a quantum system is expressed only in terms of energy difference between the carrier size-quantization levels. © 2001 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

The mechanism of oscillations of the half-width and intensity of the cyclotron resonance (CR) line of electrons in a semimetal quantum well based on an InAs/AlSb/GaSb heterostructure is investigated experimentally and theoretically. It is shown that the oscillations of the CR spectrum are due to mixing of states of the spatially separated two-dimensional electrons and holes. © 1998 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Terahertz emission accompanying heating of two-dimensional electrons by a strong electric field applied along size-quantized GaAs/AlGaAs layers is observed and investigated. The emission is due to indirect optical transitions of hot electrons in the bottom size-quantization band. The experimentally obtained emission spectra are compared with the spectra calculated taking into account scattering of electrons by optical phonons, impurities, and interfacial roughness and electron-electron scattering. Satisfactory agreement is obtained. The temperature of the hot electrons is determined from a comparison of the spectra. [ABSTRACT FROM AUTHOR]