Issue
EPL
Volume 78, Number 6, June 2007
Article Number 67005
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/78/67005
Published online 01 June 2007
EPL, 78 (2007) 67005
DOI: 10.1209/0295-5075/78/67005

On the superfluid properties of a polaritonic system

A. Semenov1 and Yu. Lozovik2

1  P.N. Lebedev Physical Institute - 119991 Moscow, Russia
2  Institute of Spectroscopy - 142190 Troitsk, Moscow Region, Russia


received 22 March 2007; accepted in final form 8 May 2007; published June 2007
published online 1 June 2007

Abstract
Superfluidity of a two-dimensional system of excitonic polaritons in an optical microcavity with embedded quantum well is considered. By using the effective low-energy action for thermodynamic phase fluctuations we obtain the expression for the analogue of superfluid density in the system in terms of the "current-current" correlation function. The expression for the "current" operator is also derived. Using the Weakly interacting Bose gas approximation we calculate the "superfluid density" in a polaritonic system and discuss the Kosterlitz-Thouless phase transition in the system.

PACS
71.36.+ - Polaritons (including photon-phonon and photon-magnon interactions).
71.35.Lk - Collective effects (Bose effects, phase space filling, and excitonic phase transitions).
67.57.De - Superflow and hydrodynamics.

© Europhysics Letters Association 2007