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1
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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
Content available remote

Infrared Reflectance Kramers-Kronig Analysis by Anchor-Window Technique

81%
Tumėnas S., Kašalynas I., Karpus V., Arwin H.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
140-142
EN
An algorithm for the Kramers-Kronig analysis of the reflectivity spectra, based on an anchor-window technique is presented. The high-frequency asymptote, required for the Kramers-Kronig analysis, is determined by minimizing differences between the Kramers-Kronig-deduced optical constants of a system under investigation and known optical constants measured in a small anchor-window. The algorithm is illustrated by applying it for a reconstruction of the optical conductivity σ(ω) of the fci-ZnMgRE quasicrystals in the spectral range of 0.01-6.5 eV from the experimental IR Fourier-transform reflectivity data and the experimental spectral ellipsometry VIS-UV data. The reliability of the suggested Kramers-Kronig analysis technique is confirmed by independent infrared spectral ellipsometry σ(ω) measurements for fci-ZnMgRE.
3
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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.
4
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Charge Carrier Transport Properties in Single-Walled Carbon Nanotube Fibers

52%
Ksenevich V., Seliuta D., Martūnas Z., Kašalynas I., Valušis G., Galibert J., Kozlov M., Samuilov V.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
1039-1042
EN
Transport properties via temperature dependences of sample resistance R(T) and influence of microwave field of 10 GHz on the conductivity of the single-walled carbon nanotubes fibers are investigated. The R(T) dependences studied within 4.2-300 K can be well approximated by the Mott law for 3D variable range hopping below T=80 K and by typical law for fluctuation-induced tunnelling model within the temperature range 80-300 K. We associate the observed increase in the conductivity with microwave power by increase in hopping probability of the charge carriers between single-walled carbon nanotubes.
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
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2011
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vol. 119
|
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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