Amplitude-mode dynamics of polariton condensates

Details Amplitude-mode dynamics of polariton condensates Amplitude-mode dynamics of polariton condensates

2011-05-11

arxiv.org/abs/1105.2227v1

Phys. Rev. Lett. 107, 040401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.107.040401

We study the stability of collective amplitude excitations in non-equilibrium 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 wavevectors, 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.

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