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Optically Driven Domain Instability and High-Frequency Current Oscillations in Photoexcited GaAs under Nonuniform Electron Heating

100%
Subačius L., Kašalynas I.
Acta Physica Polonica A
|
2005
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vol. 107
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issue 2
275-279
EN
Fast domain instabilities induced by light-interference pattern in dc-biased semi-insulating GaAs are investigated. Current oscillations in GHz-frequency range are observed due to nonuniform electron heating and domains formation in light-induced grating. Characteristic features of the oscillations under various experimental conditions are presented. Numerical calculations based on the hot-electron hydrodynamic model are used to explain the observed nonlinear features under various external bias and periods of the grating.
2
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On Oscillating Carrier Dynamics in Highly Excited InP:Fe Crystals

81%
Subačius L., Kadys A., Jarašiūnas K., Kamiński P.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
855-858
EN
The numerical analysis and experimental data on time-resolved four-wave mixing confirmed a novel origin of oscillations in subnanosecond carrier dynamics in highly excited InP:Fe crystals. The effect was attributed to simultaneous presence of electron and hole gratings, which drift in the space charge field and contribute constructively or destructively to refractive index modulation in time domain.
3
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Hot-Electron Effects in High-Resistivity InSb

81%
Ašmontas S., Subačius L., Valušis G.
Acta Physica Polonica A
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1993
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vol. 84
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issue 4
717-720
EN
We report that in the presence of random potential of the conduction band hot-electron transport can exhibit some novel features, some of which can be observed in dependencies of electric conductivity, mean electron energy and noise temperature on electric field strength.
4
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High-Speed Quadratic Electrooptic Nonlinearity in dc-Biased InP

71%
Subačius L., Kašalynas I., Vingelis M., Aleksiejūnas R., Jarašiūnas K.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
280-285
EN
We present experimental data on degenerate four-wave mixing as well as simulation results of fast optical nonlinearities in highly-excited semi-insulating InP under applied dc-field. Hot-electron transport governed enhancement of optical nonlinearity is obtained by applying a dc-field of 10-14 kV/cm at full-modulation depth of a light-interference pattern. The hydrodynamic model, which incorporates both free-carrier and photorefractive nonlinearities is used to explain the experimentally observed features. We show that the enhancement of optical nonlinearity is due to the quadratic electrooptic effect.
5
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Strong Electric Field Driven Carrier Transport Non-Linearities in n-Type GaAs/AlGaAs Superlattices

52%
Subačius L., Venckevičius R., Kašalynas I., Seliuta D., Valušis G., Schmidt J., Lisauskas A., Roskos H., Alekseev K., Köhler K.
Acta Physica Polonica A
|
2011
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vol. 119
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issue 2
167-169
EN
Nanosecond pulsed technique was used to study and discriminate strong electric field induced effects in carrier transport in silicon doped GaAs/Al_{0.3}Ga_{0.7}As superlattices at room temperature. The experiment shows that the superlattice can serve as gain media to employ parametric phenomena for microwave amplification.
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