Zero-point excitation of a circularly moving detector in an atomic condensate and phonon laser dynamical instabilities

• URL: http://arxiv.org/abs/2001.08646v3
• Date: Wed, 23 Sep 2020 20:53:19 GMT
• Title: Zero-point excitation of a circularly moving detector in an atomic condensate and phonon laser dynamical instabilities
• Authors: Jamir Marino, Gabriel Menezes, Iacopo Carusotto
• Abstract summary: We study a circularly moving impurity in an atomic condensate for realisation of superradiance phenomena in tabletop experiments. For sufficiently large rotation speeds, the zero-point fluctuations of the phonon field induce a sizeable excitation rate of the detector.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study a circularly moving impurity in an atomic condensate for the realisation of superradiance phenomena in tabletop experiments. The impurity is coupled to the density fluctuations of the condensate and, in a quantum field theory language, it serves as an analog of a detector for the quantum phonon field. For sufficiently large rotation speeds, the zero-point fluctuations of the phonon field induce a sizeable excitation rate of the detector even when the condensate is initially at rest in its ground state. For spatially confined condensates and harmonic detectors, such a superradiant emission of sound waves provides a dynamical instability mechanism leading to a new concept of phonon lasing. Following an analogy with the theory of rotating black holes, our results suggest a promising avenue to quantum simulate basic interaction processes involving fast moving detectors in curved space-times.

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