29.10.2025, 16:00, E-R2-2011.
Evgeny Tereschenkov, MIPT.
Quantum properties of optical systems with strong electron-phonon coupling
Abstract:
The report will present the available results concerning the influence of optical phonons in materials with strong electron-phonon coupling, which is equivalent to a large Fröhlich constant, on the properties of optical systems. In particular, it was shown that the presence of a strong coupling between the electronic and vibrational subsystems in a quantum dot leads to a dependence of the frequency at which the maximum radiation intensity is observed on the pump intensity, which is in good agreement with experiment. It was shown that the presence of a large coupling constant between optical phonons and the dipole moment of a quantum dot significantly changes the laser operating modes: modes with the generation of coherent phonons and a chaotic mode appear. It was also discovered that for molecules with a large Fröhlich constant, there are regions of laser system parameters in which several regimes are stable at once, and the implementation of one or another of them depends on the initial state of the system. It was shown that periodic collapses and revivals are observed in the dynamics of the molecular dipole moment, where there is a strong coupling between the electronic and vibrational degrees of freedom. Also a theoretical model that predicts the formation of luminescence in diamond defects such as NV centers on a timescale of tens of femtoseconds was proposed. It was demonstrated that a third-order singularity can exist in an optomechanical system. It was shown that by varying the pump intensity, it is possible to change the type of quasiparticle generated by the optomechanical system.
Speaker’s bio:
In 2016, I entered the Moscow Institute of Physics and Technology (MIPT). I completed my bachelor's degree in 2020 and my master's degree in 2022. Since 2022, I have been a PhD student at MIPT in the Department of Electrodynamics of Complex Systems and Nanophotonics. I have also been a junior researcher at the Dukhov Research Institute of Automation since 2022.
