Zobay, O. ; Rosenkranz, M. (2006)
Phase transition of interacting Bose gases in weak periodic potentials.
In: Physical Review A, 74 (5)
doi: 10.1103/PhysRevA.74.053623
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We study the condensation of a homogeneous interacting Bose gas in the presence of a superimposed weak periodic potential. In contrast to, e.g., a harmonic trap, the periodic potential does not reduce the significance of long-wavelength fluctuations and thus influences the phase transition in a more profound way. We present general thermodynamic descriptions of the system above condensation in terms of mean-field as well as renormalization-group theory. Our approaches are based on describing the interplay between the effects of the interactions and the potential by means of a renormalization of the potential amplitude. These theories are then used to study the critical chemical potential and particle density and their dependence on the properties of the applied potential. A main result of our investigations concerns the characteristic nonperturbative momentum scale kc of the critical interacting Bose gas. It is shown that the existence of this momentum scale becomes macroscopically manifest in the behavior of the critical thermodynamic properties.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2006 |
| Autor(en): | Zobay, O. ; Rosenkranz, M. |
| Art des Eintrags: | Bibliographie |
| Titel: | Phase transition of interacting Bose gases in weak periodic potentials |
| Sprache: | Englisch |
| Publikationsjahr: | 27 November 2006 |
| Verlag: | APS Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review A |
| Jahrgang/Volume einer Zeitschrift: | 74 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1103/PhysRevA.74.053623 |
| Kurzbeschreibung (Abstract): | We study the condensation of a homogeneous interacting Bose gas in the presence of a superimposed weak periodic potential. In contrast to, e.g., a harmonic trap, the periodic potential does not reduce the significance of long-wavelength fluctuations and thus influences the phase transition in a more profound way. We present general thermodynamic descriptions of the system above condensation in terms of mean-field as well as renormalization-group theory. Our approaches are based on describing the interplay between the effects of the interactions and the potential by means of a renormalization of the potential amplitude. These theories are then used to study the critical chemical potential and particle density and their dependence on the properties of the applied potential. A main result of our investigations concerns the characteristic nonperturbative momentum scale kc of the critical interacting Bose gas. It is shown that the existence of this momentum scale becomes macroscopically manifest in the behavior of the critical thermodynamic properties. |
| Zusätzliche Informationen: | Art.No.: 053623 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Angewandte Physik |
| Hinterlegungsdatum: | 20 Nov 2008 08:20 |
| Letzte Änderung: | 04 Apr 2023 09:53 |
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