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Your search keyword '"Vinnichenko, M. Ya."' showing total 91 results
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91 results on '"Vinnichenko, M. Ya."'

8. Optical access to folded transverse acoustic phonon doublet in 6H-SiC.

Author

Shalygin, V. A., Adamov, R. B., Vinnichenko, M. Ya., Moldavskaya, M. D., and Firsov, D. A.

Subjects
ACOUSTIC phonons, DIELECTRIC function, PHONONS, REFRACTIVE index, ABSORPTION coefficients, PHONON scattering
Abstract

We report on the study of far-infrared transmission in silicon carbide of 6H polytype in the region of IR active folded transverse acoustic (FTA) phonon doublet. Joint analysis of the transmittance spectra obtained at low and high resolutions is performed to determine spectral dependences of the refractive index and absorption coefficient. A dual Lorentz oscillator model is used to simulate the FTA phonon contributions to the dielectric function. The oscillator strengths and phonon lifetimes for both the components of the FTA phonon doublet in 6H-SiC are determined. At temperature decrease from 300 to 5 K, the FTA phonon lifetimes increase more than six times, while the oscillator strengths remain the same. [ABSTRACT FROM AUTHOR]

Published
2021
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16. Selective terahertz emission due to electrically excited 2D plasmons in AlGaN/GaN heterostructure.

Author

Shalygin, V. A., Moldavskaya, M. D., Vinnichenko, M. Ya., Maremyanin, K. V., Artemyev, A. A., Panevin, V. Yu., Vorobjev, L. E., Firsov, D. A., Korotyeyev, V. V., Sakharov, A. V., Zavarin, E. E., Arteev, D. S., Lundin, W. V., Tsatsulnikov, A. F., Suihkonen, S., and Kauppinen, C.

Subjects
MAXWELL equations, SUBMILLIMETER waves, HOT carriers, ELECTRON temperature, ELECTRIC fields
Abstract

Terahertz radiation emission from an electrically excited AlGaN/GaN heterostructure with a surface metal grating was studied under conditions of two-dimensional (2D) electron heating by the lateral electric field. Intensive peaks related to nonequilibrium 2D plasmons were revealed in the terahertz emission spectra with up to 4 times selective amplification of the radiation emission in the vicinity of 2D plasmon resonance. This selective emission was shown to be frequency-controllable by the grating period. Exact spectral positions of the 2D plasmon resonances were preliminarily experimentally detected with the help of equilibrium transmission spectra measured at various temperatures. The resonance positions are in a satisfactory agreement with the results of theoretical simulation of the transmission spectra performed using a rigorous solution of Maxwell's equations. The effective temperature of hot 2D electrons was determined by means of I – V characteristics and their analysis using the power balance equation. It was shown that for a given electric field, the effective temperature of nonequilibrium 2D plasmons is close to the hot 2D electron temperature. The work may have applications in GaN-based electrically pumped emitters of terahertz radiation. [ABSTRACT FROM AUTHOR]

Published
2019
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30. Terahertz Emission due to Radiative Decay of Hot 2D Plasmons in AlGaN/GaN Heterojunction

Author

Shalygin, V. A., primary, Arteev, D. S., additional, Lundin, W. V., additional, Korotyeyev, V. V., additional, Suihkonen, S., additional, Kauppinen, C., additional, Moldavskaya, M. D., additional, Vinnichenko, M. Ya., additional, Panevin, V. Yu., additional, Maremyanin, K. V., additional, Firsov, D. A., additional, Vorobjev, L. E., additional, Sakharov, A. V., additional, and Zavarin, E. E., additional

Published
2019
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33. Two-dimensional plasmons in a GaN/AlGaN heterojunction

Author

Vinnichenko, M Ya, primary, Shalygin, V A, additional, Moldavskaya, M D, additional, Artemyev, A A, additional, Melentev, G A, additional, Vorobjev, L E, additional, Firsov, D A, additional, Korotyeyev, V V, additional, Sakharov, A V, additional, Zavarin, E E, additional, Arteev, D S, additional, Lundin, W V, additional, Suihkonen, S, additional, and Kauppinen, C, additional

Published
2019
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