Probing the excitation spectrum of polariton condensates

Year: 2009

Authors: Wouters M., Carusotto I.

Autors Affiliation: Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland; CNR-INFM BEC Center and Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy; Institute of Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland

Abstract: We propose a four-wave mixing experiment to probe the elementary excitation spectrum of a nonequilibrium Bose-Einstein condensate of exciton-polaritons under nonresonant pumping. Analytical calculations based on mean-field theory show that this method is able to reveal the characteristic negative energy feature of the Bogoliubov dispersion. Numerical simulations including the finite spatial profile of the excitation laser spot and a weak disorder confirm the practical utility of the method for realistic condensates.

Journal/Review: PHYSICAL REVIEW B

Volume: 79 (12)      Pages from: 125311  to: 125311

More Information: We wish to thank V. Savona, D. Sarchi, M. Richard, K. Lagoudakis, A. Baas, and B. Pietka for continuous stimulating discussions on polariton condensates. I. C. acknowledges financial support from the Italian MIUR, the EuroQUAM-FerMix program, and the French IFRAF.
KeyWords: Bose-Einstein condensation; excitons; numerical analysis; polaritons;
DOI: 10.1103/PhysRevB.79.125311

Citations: 19
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