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Photonic engineering providing conditions for direct exciton macroscopic coherence at elevated temperatures
Author(s): Nina S. Voronova; Igor L. Kurbakov; Yurii E. Lozovik
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Paper Abstract

The possibility to observe a macroscopically coherent state in a gas of two-dimensional direct excitons at temperatures up to tens of Kelvin is described. The dramatic increase of the exciton lifetime allowing effective thermalization is predicted for the o_-resonant cavities that strongly suppress exciton recombination. The material systems considered are single GaAs quantum wells of different thicknesses and a transition metal dichalcogenide monolayer, embedded in a layered medium with subwavelength period. The quantum hydrodynamic approach combined with the Bogoliubov description yield the one-body density matrix of the system. Employing the Kosterlitz-Thouless “dielectric screening” problem to account for vortices, we obtain the superfluid and the condensate densities and the critical temperature of the Berezinskii-Kosterlitz-Thouless crossover, for all geometries in consideration. Experimentally observable many fold increase of the photoluminescence intensity from the structure as it is cooled below the critical temperature is predicted.

Paper Details

Date Published: 26 February 2019
PDF: 17 pages
Proc. SPIE 10912, Physics and Simulation of Optoelectronic Devices XXVII, 1091205 (26 February 2019); doi: 10.1117/12.2509770
Show Author Affiliations
Nina S. Voronova, National Research Nuclear Univ. MEPhI (Russian Federation)
Skolkovo Institute of Science and Technology (Russian Federation)
Russian Quantum Ctr. (Russian Federation)
Igor L. Kurbakov, Institute of Spectroscopy (Russian Federation)
Yurii E. Lozovik, Institute of Spectroscopy (Russian Federation)
National Research Univ. Higher School of Economics (Russian Federation)

Published in SPIE Proceedings Vol. 10912:
Physics and Simulation of Optoelectronic Devices XXVII
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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