Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85893
Title: Spontaneous Symmetry Breaking in a Polariton and Photon Laser
Authors: Ohadi, H.
Kammann, E.
Liew, Timothy Chi Hin
Lagoudakis, K. G.
Kavokin, A. V.
Lagoudakis, P. G.
Keywords: Polaritons
Photon lasers
Issue Date: 2012
Source: Ohadi, H., Kammann, E., Liew, T. C. H., Lagoudakis, K. G., Kavokin, A. V., & Lagoudakis, P. G. (2012). Spontaneous Symmetry Breaking in a Polariton and Photon Laser. Physical Review Letters, 109(1), 016404-.
Series/Report no.: Physical Review Letters
Abstract: We report on the simultaneous observation of spontaneous symmetry breaking and long-range spatial coherence both in the strong- and the weak-coupling regime in a semiconductor microcavity. Under pulsed excitation, the formation of a stochastic order parameter is observed in polariton and photon lasing regimes. Single-shot measurements of the Stokes vector of the emission exhibit the buildup of stochastic polarization. Below threshold, the polarization noise does not exceed 10%, while above threshold we observe a total polarization of up to 50% after each excitation pulse, while the polarization averaged over the ensemble of pulses remains nearly zero. In both polariton and photon lasing regimes, the stochastic polarization buildup is accompanied by the buildup of spatial coherence. We find that the Landau criterion of spontaneous symmetry breaking and Penrose-Onsager criterion of long-range order for Bose-Einstein condensation are met in both polariton and photon lasing regimes.
URI: https://hdl.handle.net/10356/85893
http://hdl.handle.net/10220/43892
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.109.016404
Schools: School of Physical and Mathematical Sciences 
Rights: © 2012 American Physical Society. This paper was published in Physical Review Letters and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: [http://dx.doi.org/10.1103/PhysRevLett.109.016404]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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