Abstract: | |
Parametric amplification of quantum fluctuations constitutes a fundamental mechanism for spontaneous symmetry breaking. In our experiments, a spinor condensate acts as a parametric amplifier of spin modes, resulting in a twofold spontaneous breaking of spatial and spin symmetry in the amplified clouds. Our experiments permit a precise analysis of the amplification in specific spatial Bessel-like modes, allowing for the detailed understanding of the double symmetry breaking. On resonances that create vortex-antivortex superpositions, we show that the cylindrical spatial symmetry is spontaneously broken, but phase squeezing prevents spin-symmetry breaking. If, however, nondegenerate spin modes contribute to the amplification, quantum interferences lead to spin-dependent density profiles and hence spontaneously formed patterns in the longitudinal magnetization. © 2010 The American Physical Society.
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License of this version: | Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. |
Publication type: | Article |
Publishing status: | publishedVersion |
Publication date: | 2010 |
Keywords english: | Antivortex, Density profile, Longitudinal magnetization, Parametric amplification, Precise analysis, Quantum fluctuation, Quantum interference, Spatial symmetry, Spin modes, Spin symmetry, Spinor condensates, Spontaneous symmetry breaking, Symmetry-breaking, Bioelectric phenomena, Microwave amplifiers, Parametric amplifiers, Quantum electronics, Amplification |
DDC: | 530 | Physik |
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