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Amplitude-mode dynamics of polariton condensates
We study the stability of collective amplitude excitations in nonequilibrium polariton condensates. These excitations correspond to renormalized upper polaritons and to the collective amplitude modes of atomic gases and superconductors. They would be present following a quantum quench or could be created directly by resonant excitation. We show that uniform amplitude excitations are unstable to the production of excitations at finite wave vectors, leading to the formation of density-modulated phases. The physical processes causing the instabilities can be understood by analogy to optical parametric oscillators and the atomic Bose supernova.
Keyword(s): Condensed matter physics; polaritons; Nanoscience & Materials
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): R. T. Brierley, P. B. Littlewood and P. R. Eastham, Amplitude-mode dynamics of polariton condensates, Physical Review Letters, 107, 4, 2011, 040401
First Indexed: 2014-05-13 05:47:04 Last Updated: 2017-04-26 08:34:05