Dr. Igor L. Kurbakov Profile

Dr. Igor L. Kurbakov

at Institute of Spectroscopy

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Proceedings Article | 26 February 2019 Paper

Photonic engineering providing conditions for direct exciton macroscopic coherence at elevated temperatures

Nina Voronova, Igor Kurbakov, Yurii Lozovik

Proceedings Volume 10912, 1091205 (2019) https://doi.org/10.1117/12.2509770

KEYWORDS: Excitons, Quantum wells, Gallium arsenide, Dielectrics, Refractive index, Solids, Silver, Luminescence

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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.

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