Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Nonlinear behavior of the nonradiative exciton reservoir in quantum wells. / Kurdyubov, A. S. ; Trifonov, A. V. ; Mikhailov, A. V. ; Efimov, Yu. P. ; Eliseev, S. A. ; Lovtcius, V. A. ; Ignatiev, I. V. .
в: Physical Review B, Том 107, № 7, 075302, 17.02.2023.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Nonlinear behavior of the nonradiative exciton reservoir in quantum wells
AU - Kurdyubov, A. S.
AU - Trifonov, A. V.
AU - Mikhailov, A. V.
AU - Efimov, Yu. P.
AU - Eliseev, S. A.
AU - Lovtcius, V. A.
AU - Ignatiev, I. V.
PY - 2023/2/17
Y1 - 2023/2/17
N2 - Excitons and free charge carriers with large wave vectors form a nonradiative reservoir, which can strongly affect properties of bright excitons due to the exciton-exciton and exciton-carrier interactions. In the present work, the dynamics of quasiparticles in the reservoir at different areal densities is experimentally studied in a GaAs/AlGaAs quantum well using a time-resolved reflectance spectroscopy of nonradiative broadening of exciton resonances. The population of the reservoir is controlled either by the excitation power or by the temperature of the structure under study. The dynamics is quantitatively analyzed in the framework of the model developed earlier [A. S. Kurdyubov et al., Phys. Rev. B 104, 035414 (2021)]. The model considers several dynamic processes, such as scattering of photoexcited excitons into the reservoir, dissociation of excitons into free charge carriers and the reverse process, carrier-induced exciton scattering into the light cone depleting the reservoir, thermally activated nonradiative losses of charge carriers. We have found that competition of these processes leads to highly nonlinear dynamics of reservoir excitons, although their density is far below the exciton Mott transition densities. Characteristic rates of the processes and their dependences on the excitation power and the temperature are determined.
AB - Excitons and free charge carriers with large wave vectors form a nonradiative reservoir, which can strongly affect properties of bright excitons due to the exciton-exciton and exciton-carrier interactions. In the present work, the dynamics of quasiparticles in the reservoir at different areal densities is experimentally studied in a GaAs/AlGaAs quantum well using a time-resolved reflectance spectroscopy of nonradiative broadening of exciton resonances. The population of the reservoir is controlled either by the excitation power or by the temperature of the structure under study. The dynamics is quantitatively analyzed in the framework of the model developed earlier [A. S. Kurdyubov et al., Phys. Rev. B 104, 035414 (2021)]. The model considers several dynamic processes, such as scattering of photoexcited excitons into the reservoir, dissociation of excitons into free charge carriers and the reverse process, carrier-induced exciton scattering into the light cone depleting the reservoir, thermally activated nonradiative losses of charge carriers. We have found that competition of these processes leads to highly nonlinear dynamics of reservoir excitons, although their density is far below the exciton Mott transition densities. Characteristic rates of the processes and their dependences on the excitation power and the temperature are determined.
UR - https://www.mendeley.com/catalogue/c57541ae-1f5e-3718-82f6-73b59d102f14/
U2 - 10.1103/PhysRevB.107.075302
DO - 10.1103/PhysRevB.107.075302
M3 - Article
VL - 107
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 7
M1 - 075302
ER -
ID: 106419047