https://doi.org/10.1140/epjp/s13360-025-06635-z
Regular Article
Photon echo on a three-level system of discrete spectrum of a spherical quantum dot
1
Shirak State University, 4 Paruyr Sevak Str., 3126, Gyumri, Armenia
2
Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine
3
Institute of Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine
4
Yerevan State University, 1 Alex Manoogian Str., 0025, Yerevan, Armenia
Received:
16
February
2025
Accepted:
8
July
2025
Published online:
5
August
2025
The analysis of photon echo (PE) formation in the mode of two-photon excitation of a three-level system of the size-quantized spectrum of a spherical semiconductor quantum dot (SQD) is carried out. The coherent response is due to the reversibility of the dephasing processes of emitting dipoles caused by inhomogeneous broadening due to the dispersion of the QD sizes. The main results are: expression of polarization at the Stokes frequency and analysis of the evolution of the coherent response of a nanosized medium with a picosecond time resolution under conditions of size quantization, estimation of the characteristic time of reversible phase relaxation based on the shape of the coherent response and the role of size dispersion in the process of optical dephasing, the possibility of direct estimation of dipole matrix elements of intraband electron transitions, as well as the relaxation characteristic of the optically forbidden transition of the model PE process based on the expression of the echo amplitude.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
