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Conference 11999 > Paper 11999-9
Paper 11999-9

Finite-temperature description and transition diagram of exciton-like polariton condensates

Abstract

We develop the Hartree-Fock-Bogoliubov description for exciton-polaritons to describe low-energy excitations at finite temperatures, accounting for the full polariton dispersion, momentum-dependent interactions and lifetimes. Beyond the mean-field approximation, the hydrodynamic form of one-body density matrix is used to describe quasicondensation. We find critical temperatures of Bose condensation and the Berezinskii-Kosterlitz-Thouless topological transition as functions of positive photon-exciton detuning, and show that the coherence length increases up to 10 times compared to zero detuning. Additionally, we show that the non-condensed fraction and the presence of dark reservoir affect the Bogoliubov sound velocity, and compare our results to the experimental findings.

Presenter

National Research Nuclear Univ. MEPhI (Russian Federation)
Nina S. Voronova graduated from Moscow Physical Engineering Institute (State University) in 2006. During her post-graduate study (2006 to 2009) under supervision of Prof. Dr. Yu. E. Lozovik, started to work on collective excitations in low-dimensional systems. Received the Ph.D. degree in 2012 in Nanostructures Spectroscopy Lab, Institute of Spectroscopy, Russian Academy of Sciences. Since 2009, works at National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), currently as Associate Professor of the Theoretical physics department. In the end of 2015, joined the theoretical group of Prof. Alexey Kavokin in the group of Quantum Polaritonics at Russian Quantum Center. She authored papers on vortices in polariton liquids, Rabi-oscillations in microcavities. Proposed the mechanism for off-resonant direct exciton Bose condensation. The area of interests is excitons, exciton-polaritons, Bose condensates, topological defects, superfluidity, superconductivity.
Author
National Research Nuclear Univ. MEPhI (Russian Federation)
Author
Institute of Spectroscopy RAS (Russian Federation)
Author
Yurii E. Lozovik
Institute of Spectroscopy RAS (Russian Federation)
Presenter/Author
National Research Nuclear Univ. MEPhI (Russian Federation)