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The Goldstone mode of planar optical parametric oscillators | | Michiel Wouters
; Iacopo Carusotto
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29 Jun 2006 | | Subject: | Other | | Abstract: | We propose an experimental setup to probe the low-lying excitation modes of a parametrically oscillating planar cavity, in particular the soft Goldstone mode which appears as a consequence of the spontaneously broken U(1) symmetry of signal/idler phase rotations. Differently from the case of thermodynamical equilibrium, the Goldstone mode of such a driven-dissipative system is an overdamped mode, whose linewidth goes to zero in the long-wavelength limit. When the phase of the signal/idler emission is pinned by an additional laser beam in the vicinity of the signal emission, the U(1) symmetry is explicitely broken and a gap opens in the Goldstone mode dispersion. This results in a dramatic broadening of the response to the probe. Quantitative predictions are given for the case of semiconductor planar cavities in the strong exciton-photon coupling regime. | | Source: | arXiv, cond-mat/0606755 | | Services: | Forum | Review | PDF | Favorites | |
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