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  • 1995-1999  (3)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Nonlinear AC response in superfluid films (1996)
    Springer
    Journal of low temperature physics 102 (1996), S. 171-191 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have studied the non-linear response of a helium film to an external AC drive near the Kosterlitz Thouless superfluid transition by using the theory of Ambegaokaret al. Previously we have investigated the weakly non-linear response, corresponding to a small ratio of the diffusion lengthr D to the length scaler v = ħ/mv n wherev n is the velocity of the substrate. Here we extend the calculation to describe the opposite regime where the ratior D /r v is large. The period shift and Q factor of a torsional oscillator containing the film are calculated for the strongly non-linear regime. The expected features of the response in the intermediate regime wherer D ∼ r v are obtained by smoothly interpolating the results obtained in the two limiting cases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00755116
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Thermodynamics of a Trapped Bose-Condensed Gas (1997)
    Springer
    Journal of low temperature physics 109 (1997), S. 309-355 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We investigate the thermodynamic behaviour of a Bose gas interacting with repulsive forces and confined in a harmonic anisotropic trap. We develop the formalism of mean field theory for non uniform systems at finite temperature, based on the generalization of Bogoliubov theory for uniform gases. By employing the WKB semiclassical approximation for the excited states we derive systematic results for the temperature dependence of various thermodynamic quantities: condensate fraction, density profiles, thermal energy, specific heat and moment of inertia. Our analysis points out important differences with respect to the thermodynamic behaviour of uniform Bose gases. This is mainly the consequence of a major role played by single particle states at the boundary of the condensate. We find that the thermal depletion of the condensate is strongly enhanced by the presence of repulsive interactions and that the critical temperature is decreased with respect to the predictions of the non-interacting model. Our work points out an important scaling behaviour exhibited by the system in large N limit. Scaling permits to express all the relevant thermodynamic quantities in terms of only two parameters: the reduced temperature t = T/T c 0 and the ratio between the T = 0 value of the chemical potential and the critical temperature T c 0 for Bose-Einstein condensation. Comparisons with first experimental results and ab-initio calculations are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10909-005-0089-x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Thermodynamics of a trapped Bose-condensed gas (1997)
    Springer
    Journal of low temperature physics 109 (1997), S. 309-355 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We investigate the thermodynamic behaviour of a Bose gas interacting with repulsive forces and confined in a harmonic anisotropic trap. We develop the formalism of mean field theory for non uniform systems at finite temperature, based on the generalization of Bogoliubov theory for uniform gases. By employing the WKB semiclassical approximation for the excited states we derive systematic results for the temperature dependence of various thermodynamic quantities: condensate fraction, density profiles, thermal energy, specific heat and moment of inertia. Our analysis points out important differences with respect to the thermodynamic behaviour of uniform Bose gases. This is mainly the consequence of a major role played by single particle states at the boundary of the condensate. We find that the thermal depletion of the condensate is strongly enhanced by the presence of repulsive interactions and that the critical temperature is decreased with respect to the predictions of the non-interacting model. Our work points out an important scaling behaviour exhibited by the system in largeN limit. Scaling permits to express all the relevant thermodynamic quantities in terms of only two parameters: the reduced temperaturet=T/T c 0 and the ratio between theT=0 value of the chemical potential and the critical temperatureT c 0 for Bose-Einstein condensation. Comparisons with first experimental results and ab-initio calculations are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02396737
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
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