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Superflow of resonantly driven polaritons against a defect

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Cancellieri, E., Marchetti, F. M., Szymanska, M. H. (Marzena H.) and Tejedor, C.. (2010) Superflow of resonantly driven polaritons against a defect. Physical Review B (Condensed Matter and Materials Physics), Volume 82 (Number 22). article no. 224512 . ISSN 1098-0121

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Abstract

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 nonperturbatively 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 explain 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 Cherenkov radiation, and the percentage of particles scattered by the defect, show a smooth crossover rather than a sharp thresholdlike behavior typical of superfluids which obey the Landau criterion.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Polaritons, Superfluidity, Gross-Pitaevskii equations, Cherenkov radiation, Equilibrium
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: 2010
Volume: Volume 82
Number: Number 22
Page Range: article no. 224512
Identification Number: 10.1103/PhysRevB.82.224512
Status: Peer Reviewed
Publication Status: Published
Funder: Spain. Ministerio de Educación y Ciencia (MEC), Spain. CAM, European Social Fund (ESF), European Science Foundation (ESF)
Grant number: MAT2008-01555 QOIT-CSD2006-00019 (MEC) ; S-2009/ESP-1503 (CAM)
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URI: http://wrap.warwick.ac.uk/id/eprint/41626

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