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Article
Initiation of Pharmacotherapy as a Risk Factor of Falling in Older Patients
The paper presents literary and original data on the problems of falling for elderly patients. The relationship between the occurrence of a fall and the initiation of drug therapy with a known negative effect ...
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Article
Optical and electrical properties of GaN: Si-based microstructures with a wide range of do** levels
The optical and electrical properties of silicon-doped epitaxial gallium nitride layers grown on sapphire have been studied. The studies have been performed over a wide range of silicon concentrations on each ...
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Article
Lateral photoconductivity in structures with Ge/Si quantum dots
The spectra of lateral photoconductivity and optical absorption caused by the intraband optical transitions of holes in Ge/Si quantum dots are studied at different lattice temperatures. Polarization-dependent ...
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Article
Exciton spectra and electrical conductivity of epitaxial silicon-doped GaN layers
Optical spectra and electrical conductivity of silicon-doped epitaxial gallium nitride layers with uncompensated donor concentrations N D — N ...
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Article
Photoinduced and equilibrium optical absorption in Ge/Si quantum dots
The results of studies of the optical absorption spectra in Ge/Si quantum dot structures in the mid-infrared region are reported. Two types of structures different in terms of the method used for quantum dot f...
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Article
Current-induced spin polarization of holes in tellurium
The current-induced optical activity in a tellurium single crystal has been experimentally investigated in the mid-infrared spectral region. The phenomenological theory of the current-induced optical activity ...
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Article
Emission of terahertz radiation from selectively doped AlGaN/GaN heterostructures under the heating of two-dimensional electrons by an electric field
The emission of terahertz radiation from a AlGaN/GaN heterostructure under the heating of two-dimensional electrons in a lateral electric field is studied. The field dependence of the temperature of hot electr...
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Article
Terahertz emission and photoconductivity in n-type GaAs/AlGaAs quantum wells: the role of resonant impurity states
Terahertz emission spectra in a longitudinal electric field and lateral photoconductivity spectra under terahertz illumination have been studied in structures with GaAs/AlGaAs quantum wells (QWs). It is shown ...
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Article
Absorption and modulation of absorption in p-GaAs/AlGaAs quantum well nanostructures
Optical phenomena in GaAs/AlGaAs quantum well nanostructures doped with acceptors were studied in the mid-IR spectral range. Equilibrium abso rption spectra were measured in a wide temperature range. Modulatio...
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Article
Emission of terahertz radiation from GaN under impact ionization of donors in an electric field
The emission of terahertz radiation from epitaxial n-GaN layers in lateral electric field was found and studied for the first time. Radiation emission was observed in fields exceeding the impurity breakdown thres...
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Article
Multifunction metal-semiconductor nanocomposites
The basic properties of metal-semiconductor nanocomposites were investigated using InN/In with In clusters as an example. Inconsistencies in the characteristic energies of optical processes occurring in these ...
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Article
Hot charge-carrier electroluminescence from laser nanostructures in the spontaneous and stimulated emission modes and absorption of IR radiation by hot electrons in quantum wells
Charge-carrier heating and the carrier concentration dependence on electric current in quantum-well laser heterostructures have been studied under conditions of spontaneous and stimulated emission. Intersubban...
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Article
Emission of terahertz radiation from GaAsN/GaAs heterostructures in an electric field
Emission of terahertz radiation from strained Be-doped GaAsN layers has been revealed at 4.2 K in postbreakdown electric fields. Heavy and light hole subbands are split in strained layers, and, along with loca...
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Article
Absorption and emission of terahertz radiation in doped GaAs/AlGaAs quantum wells
Spontaneous emission of terahertz radiation from structures with GaAs/AlGaAs quantum wells in a longitudinal magnetic field has been studied. It is shown that some bands in the emission spectrum can be related...
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Article
Spin photocurrents and the circular photon drag effect in (110)-grown quantum well structures
The study of spin photocurrents in (110)-grown quantum well structures is reported. The investigated effects comprise the circular photogalvanic effect and so far not observed circular photon drag effect. The ...
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Article
Impurity breakdown and electroluminescence in the terahertz range in p-GaAs and p-GaAsN microstructures
The current-voltage characteristics of strained GaAsN:Be layers have been studied under the conditions of hop** conductivity and impurity breakdown, and the electroluminescence of these layers has been measu...
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Article
Removal of tritium from vacuum oil by isotopic exchange
Experimental data on the removal of tritium, by isotopic exchange, from VM-5 vacuum oil are presented. It is shown that the most efficient method of extracting tritium from oil is contact with concentrated sul...
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Article
Intersubband absorption of light in heterostructures with double tunnel-coupled GaAs/AlGaAs quantum wells
Intersubband absorption of mid-IR light was studied in heterostructures with asymmetrical tunnel-coupled quantum wells in equilibrium conditions and under high-power pum** by picosecond pulses of light. The ...
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Article
Optical phenomena in InAs/GaAs heterostructures with doped quantum dots and artificial molecules
Spectra of intraband absorption of polarized mid-IR light were investigated in undoped, p-, and n-doped InAs/GaAs quantum dots (QDs) covered with an InGaAs layer. Optical matrix elements for intraband electron an...
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Article
The engineering and properties of InAs quantum dot molecules in a GaAs matrix
Arrays of InAs quantum dot (QD) molecules in the GaAs matrix, which consist of pairs of vertically aligned InAs QDs, have been synthesized by molecular beam epitaxy. A study of the resulting structures by tran...