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

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

Jan 23, 2020

6 pages

Published in:

Phys.Rev.Res. 2 (2020) 4, 042009

Published: Oct 15, 2020

e-Print:

2001.08646 [cond-mat.quant-gas]

DOI:

10.1103/PhysRevResearch.2.042009

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Abstract: (APS)

We study a circularly moving impurity in an atomic condensate for the realization 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 sizable 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 phonon lasing concept. 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.

Note:

5+9 pages, 3 figures; version accepted for publication in Phys. Rev. Research Rapid Communications

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Figures(3)

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