ФИАН
Научная деятельность
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Шарков Андрей Владимирович канд. физ.-мат. наук
Контакты
Публикации
2009
- В. В. Белых, М. Х. Нгуен, Н. Н. Сибельдин, М. Л. Скориков, В. А. Цветков, А. В. Шарков
Динамика перехода от режима слабой связи к режиму сильной связи в системе экситонных поляритонов в полупроводниковых микрорезонаторах ЖЭТФ, т. 136, стр. 550, (2009)
аннотация
The dynamics of polaritonic emission of a GaAs-based microcavity with embedded quantum wells under nonresonant optical excitation is studied. Kinetic dependences of the intensity, spectral position, and linewidth of spontaneous and stimulated emission of the microcavity are measured. It is established that the dynamics of the high-frequency shift of the emission line is qualitatively similar to the dynamics of the emission intensity, but the spectral shift attains its maximum value before the peak intensity is reached. The emission linewidth is maximal immediately after the excitation pulse. Under the conditions of spontaneous emission, the linewidth decreases steadily with time, approaching the value corresponding to low polariton densities. Under lasing conditions, the linewidth is at a minimum when the stimulated-emission intensity attains its peak value. The experimental data are analyzed on the basis of a theoretical model that describes relaxation processes taking into account exciton-exciton and exciton-free carrier interactions.
10.1134/S1063776109090131
- В. В. Белых, М. Х. Нгуен, Н. Н. Сибельдин, М. Л. Скориков, В. А. Цветков, А. В. Шарков
Динамика излучения GaAs микрорезонатора с встроенными квантовыми ямами при высоких плотностях нерезонансного возбуждения Письма в ЖЭТФ, т. 89, стр. 681, (2009)
аннотация
In a GaAs-based microcavity with embedded quantum wells, the dynamics of emission processes under high levels of nonresonant picosecond laser-pulse excitation is studied. For pump levels above the stimulation threshold, the kinetics of the intensity, spectral position, and linewidth of the emission are measured. Upon the arrival of an excitation pulse, the emission line shifts to higher energies over a time interval comparable to the time it takes for the emission intensity to attain its peak value, and then shifts in the opposite direction towards its position at low polariton densities. The width of the emission line is largest immediately after the excitation pulse and attains a minimum when the stimulated-emission intensity is maximum. It is shown that after the excitation pulse, the system is initially in a weak exciton-photon coupling regime, and a transition to a strong-coupling regime occurs with time.
10.1134/S0021364009110113
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