Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 2: Quantum Gases: Bosons 1
Q 2.9: Vortrag
Montag, 14. März 2011, 12:30–12:45, HÜL 386
Transition to quasi-condensation in a low-D Bose gas — •Carsten Henkel1, Antonio Negretti2, Stuart P. Cockburn3, and Nikolaos Proukakis3 — 1Universität Potsdam, Germany — 2Universität Ulm, Germany — 3Newcastle University, U.K.
We analyze a dilute Bose gas in a one-dimensional trap, using a modified mean field theory based on the Popov approximation [1]. This has been successfully applied to describe density profiles and the border between a quasi-condensate (qc) regime and a non-degenerate gas. We provide simple formulas in an intermediate temperature range for the qc fraction and the total density. A critical chemical potential that delimits the qc and normal phases is identified, and the possibility of a phase transition is explored. We discuss the role of the quantum pressure in a trap and of a renormalized two-body interaction in smoothing out the qc border.
[1] Al Khawaja & al, Phys. Rev. A 66 (2002) 013615; Proukakis, Phys. Rev. A 74 (2006) 053617