Goldstone mode of optical parametric oscillators in planar semiconductor microcavities in the strong-coupling regime

Year: 2007

Authors: Wouters M., Carusotto I.

Autors Affiliation: BEC-CNR-INFM and Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy;
TFVS, Universiteit Antwerpen, Universiteitsplein 1, 2610 Antwerpen, Belgium

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. A strong and narrow peak corresponding to the Goldstone mode is identified in the transmission spectrum of a weak probe beam incident on the cavity. When the U(1) symmetry is explicitly broken by an additional laser beam pinning the signal-idler phase, a gap opens in the dispersion and the Goldstone peak is dramatically suppressed. Quantitative predictions are given for the case of semiconductor planar cavities in the strong exciton-photon coupling regime.

Journal/Review: PHYSICAL REVIEW A

Volume: 76 (4)      Pages from: 043807-1  to: 043807-9

KeyWords: polaritons; BEC; goldstone mode; parametric oscillator;
DOI: 10.1103/PhysRevA.76.043807

Citations: 52
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