Status: Bibliographieeintrag
Standort: ---
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Verfasst von: | Karl, Markus [VerfasserIn]  |
| Gasenzer, Thomas [VerfasserIn]  |
Titel: | Strongly anomalous non-thermal fixed point in a quenched two-dimensional Bose gas |
Verf.angabe: | Markus Karl, Thomas Gasenzer |
Fussnoten: | Published 20 September 2017 ; Gesehen am 27.06.2018 |
Titel Quelle: | Enthalten in: New journal of physics |
Jahr Quelle: | 2017 |
Band/Heft Quelle: | 19(2017,9) Artikel-Nummer 093014, 26 Seiten |
ISSN Quelle: | 1367-2630 |
Abstract: | Universal scaling behavior in the relaxation dynamics of an isolated two-dimensional Bose gas is studied by means of semi-classical stochastic simulations of the Gross-Pitaevskii model. The system is quenched far out of equilibrium by imprinting vortex defects into an otherwise phase-coherent condensate. A strongly anomalous non-thermal fixed point is identified, associated with a slowed decay of the defects in the case that the dissipative coupling to the thermal background noise is suppressed. At this fixed point, a large anomalous exponent ##IMG## [http://ej.iop.org/images/1367-2630/19/9/093014/njpaa7eebieqn1.gif] $\eta \simeq -3$ and, related to this, a large dynamical exponent ##IMG## [http://ej.iop.org/images/1367-2630/19/9/093014/njpaa7eebieqn2.gif] $z\simeq 5$ are identified. The corresponding power-law decay is found to be consistent with three-vortex-collision induced loss. The article discusses these aspects of non-thermal fixed points in the context of phase-ordering kinetics and coarsening dynamics, thus relating phenomenological and analytical approaches to classifying far-from-equilibrium scaling dynamics with each other. In particular, a close connection between the anomalous scaling exponent η , introduced in a quantum-field theoretic approach, and conservation-law induced scaling in classical phase-ordering kinetics is revealed. Moreover, the relation to superfluid turbulence as well as to driven stationary systems is discussed. |
DOI: | doi:10.1088/1367-2630/aa7eeb |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Kostenfrei: Verlag: http://dx.doi.org/10.1088/1367-2630/aa7eeb |
| Kostenfrei: Verlag: http://stacks.iop.org/1367-2630/19/i=9/a=093014 |
| DOI: https://doi.org/10.1088/1367-2630/aa7eeb |
Sprache: | eng |
K10plus-PPN: | 157688919X |
Verknüpfungen: | → Zeitschrift |
Strongly anomalous non-thermal fixed point in a quenched two-dimensional Bose gas / Karl, Markus [VerfasserIn]
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