Theory of superfluidity in a polariton system |
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Authors: | Yu. E. Lozovik A. G. Semenov |
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Affiliation: | (1) Institute of Spectroscopy, RAS, Troitsk, Moscow Oblast, Russia;(2) Lebedev Physical Institute, RAS, Moscow, Russia |
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Abstract: | We consider the superfluidity properties of a two-dimensional system of polaritons in an optical cavity. Deriving an expression for the effective low-energy action for thermodynamic phase fluctuations, we simultaneously obtain the expression for an analogue of superfluid density in the system in terms of the current-current correlation function and also find the expression for the current operator. We describe the Bogoliubov approximation for a polariton system and calculate the superfluid density. We discuss the Berezinskii-Kosterlitz-Thouless transition in the system under study. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 154, No. 2, pp. 372–384, February, 2008. |
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Keywords: | exciton polariton superfluidity functional integration method Popov approximation |
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