Acousto-exciton interaction in a gas of 2D indirect dipolar excitons in the presence of disorder
A theory for the linear and quadratic responses of a 2D gas of indirect dipolar excitons to an external surface acoustic wave perturbation in the presence of a static random potential is considered. The theory is constructed both for high temperatures, definitely greater than the exciton gas condensation temperature, and at zero temperature by taking into account the Bose–Einstein condensation effects. The particle Green functions, the density–density correlation function, and the quadratic response function are calculated by the “cross” diagram technique. The results obtained are used to calculate the absorption of Rayleigh surface waves and the acoustic exciton gas drag by a Rayleigh wave. The damping of Bogoliubov excitations in an exciton condensate due to theirs scattering by a random potential has also been determined.
- OSTI ID:
- 22617310
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 122, Issue 3; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ACOUSTICS
BOSE-EINSTEIN CONDENSATION
CORRELATION FUNCTIONS
CORRELATIONS
DENSITY
DISTURBANCES
EXCITATION
EXCITONS
GREEN FUNCTION
INTERACTIONS
PERTURBATION THEORY
RAYLEIGH WAVES
RESPONSE FUNCTIONS
SCATTERING
SIMULATION
SOUND WAVES
SURFACES
WAVE PROPAGATION