Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-09-16
Phys. Rev. B 82, 224512 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures (published version)
Scientific paper
10.1103/PhysRevB.82.224512
In the linear response approximation, coherently driven microcavity polaritons in the pump-only configuration are expected to satisfy the Landau criterion for superfluidity at either strong enough pump powers or small flow velocities. Here, we solve non-perturbatively the time dependent Gross-Pitaevskii equation describing the resonantly-driven polariton system. We show that, even in the limit of asymptotically large densities, where in linear response approximation the system satisfies the Landau criterion, the fluid always experiences a residual drag force when flowing through the defect. We illustrate the result in terms of the polariton lifetime being finite, finding that the equilibrium limit of zero drag can only be recovered in the case of perfect microcavities. In general, both the drag force exerted by the defect on the fluid, as well as the height of Cerenkov radiation, and the percentage of particles scattered by the defect, show a smooth crossover rather than a sharp threshold-like behaviour typical of superfluids which obey the Landau criterion.
Cancellieri Emiliano
Marchetti Francesca Maria
Szymanska Marzena H.
Tejedor Carlos
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