Volume 78, Number 6, June 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 June 2007|
On the superfluid properties of a polaritonic system
P.N. Lebedev Physical Institute - 119991 Moscow, Russia
2 Institute of Spectroscopy - 142190 Troitsk, Moscow Region, Russia
Accepted: 8 May 2007
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
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