Fluctuation-damping of isolated, oscillating Bose-Einstein condensates. / Lappe, Tim; Posazhennikova, Anna; Kroha, Johann.

In: Physical Review A, Vol. 98, No. 2, 023626, 24.08.2018, p. 1-12.

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Fluctuation-damping of isolated, oscillating Bose-Einstein condensates. / Lappe, Tim; Posazhennikova, Anna; Kroha, Johann.

In: Physical Review A, Vol. 98, No. 2, 023626, 24.08.2018, p. 1-12.

Research output: Contribution to journalArticle

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Lappe, Tim ; Posazhennikova, Anna ; Kroha, Johann. / Fluctuation-damping of isolated, oscillating Bose-Einstein condensates. In: Physical Review A. 2018 ; Vol. 98, No. 2. pp. 1-12.

BibTeX

@article{b778155fee4a4b0990cd406467aa3ddc,
title = "Fluctuation-damping of isolated, oscillating Bose-Einstein condensates",
abstract = "Experiments on the nonequilibrium dynamics of an isolated Bose-Einstein condensate (BEC) in a magnetic double-well trap exhibit a puzzling divergence: While some show dissipation-free Josephson oscillations, others find strong damping. Such damping in isolated BECs cannot be understood on the level of the coherent Gross-Pitaevskii dynamics. Using the Keldysh functional-integral formalism, we describe the time-dependent system dynamics by means of a multi-mode BEC coupled to fluctuations (single-particle excitations) beyond the Gross-Pitaevskii saddle point. We find that the Josephson oscillations excite an excess of fluctuations when the effective Josephson frequency, {\~ω}J, is in resonance with the effective fluctuation energy, {\~ε}m, where both, {\~ω}J and {\~ε}m, are strongly renormalized with respect to their noninteracting values. Evaluating and using the model parameters for the respective experiments describes quantitatively the presence or absence of damping.",
author = "Tim Lappe and Anna Posazhennikova and Johann Kroha",
year = "2018",
month = aug,
day = "24",
doi = "10.1103/PhysRevA.98.023626",
language = "English",
volume = "98",
pages = "1--12",
journal = "Physical Review A",
issn = "1050-2947",
publisher = "American Physical Society",
number = "2",

}

RIS

TY - JOUR

T1 - Fluctuation-damping of isolated, oscillating Bose-Einstein condensates

AU - Lappe, Tim

AU - Posazhennikova, Anna

AU - Kroha, Johann

PY - 2018/8/24

Y1 - 2018/8/24

N2 - Experiments on the nonequilibrium dynamics of an isolated Bose-Einstein condensate (BEC) in a magnetic double-well trap exhibit a puzzling divergence: While some show dissipation-free Josephson oscillations, others find strong damping. Such damping in isolated BECs cannot be understood on the level of the coherent Gross-Pitaevskii dynamics. Using the Keldysh functional-integral formalism, we describe the time-dependent system dynamics by means of a multi-mode BEC coupled to fluctuations (single-particle excitations) beyond the Gross-Pitaevskii saddle point. We find that the Josephson oscillations excite an excess of fluctuations when the effective Josephson frequency, ω̃J, is in resonance with the effective fluctuation energy, ε̃m, where both, ω̃J and ε̃m, are strongly renormalized with respect to their noninteracting values. Evaluating and using the model parameters for the respective experiments describes quantitatively the presence or absence of damping.

AB - Experiments on the nonequilibrium dynamics of an isolated Bose-Einstein condensate (BEC) in a magnetic double-well trap exhibit a puzzling divergence: While some show dissipation-free Josephson oscillations, others find strong damping. Such damping in isolated BECs cannot be understood on the level of the coherent Gross-Pitaevskii dynamics. Using the Keldysh functional-integral formalism, we describe the time-dependent system dynamics by means of a multi-mode BEC coupled to fluctuations (single-particle excitations) beyond the Gross-Pitaevskii saddle point. We find that the Josephson oscillations excite an excess of fluctuations when the effective Josephson frequency, ω̃J, is in resonance with the effective fluctuation energy, ε̃m, where both, ω̃J and ε̃m, are strongly renormalized with respect to their noninteracting values. Evaluating and using the model parameters for the respective experiments describes quantitatively the presence or absence of damping.

U2 - 10.1103/PhysRevA.98.023626

DO - 10.1103/PhysRevA.98.023626

M3 - Article

VL - 98

SP - 1

EP - 12

JO - Physical Review A

JF - Physical Review A

SN - 1050-2947

IS - 2

M1 - 023626

ER -