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Verfasst von:Böttcher, Igor [VerfasserIn]   i
 Flörchinger, Stefan [VerfasserIn]   i
 Wetterich, Christof [VerfasserIn]   i
Titel:Hydrodynamic collective modes for cold trapped gases
Verf.angabe:I. Boettcher, S. Floerchinger and C. Wetterich
Fussnoten:Gesehen am 27.11.2017
Titel Quelle:Enthalten in: Journal of physics / B
Jahr Quelle:2011
Band/Heft Quelle:44(2011,23) Artikel-Nummer 235301, 22 Seiten
ISSN Quelle:1361-6455
Abstract:We suggest that collective oscillation frequencies of cold trapped gases can be used to test predictions from quantum many-body physics. Our motivation lies in both rigid experimental tests of theoretical calculations and a possible improvement of measurements of particle number, chemical potential or temperature. We calculate the effects of interaction, dimensionality and thermal fluctuations on the collective modes of a dilute Bose gas in the hydrodynamic limit. The underlying equation of state is provided by the non-perturbative Functional Renormalization Group or by Lee-Yang theory. The spectrum of oscillation frequencies could be measured by response techniques. Our findings are generalized to bosonic or fermionic quantum gases with an arbitrary equation of state in the two-fluid hydrodynamic regime. For any given equation of state P (μ, T ) and normal fluid density n n (μ, T ), the collective oscillation frequencies in a d -dimensional isotropic potential are found tobe the eigenvalues of an ordinary differential operator. We suggest a method of numerical solution and discuss the zero-temperature limit. Exact results are provided for harmonic traps and certain special forms of the equation of state. We also present a phenomenological treatment of dissipation effects and discuss the possibility of exciting the different eigenmodes individually.
DOI:doi:10.1088/0953-4075/44/23/235301
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.

Verlag: http://dx.doi.org/10.1088/0953-4075/44/23/235301
 Verlag: http://stacks.iop.org/0953-4075/44/i=23/a=235301
 DOI: https://doi.org/10.1088/0953-4075/44/23/235301
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1565749510
Verknüpfungen:→ Zeitschrift

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