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DY: Fachverband Dynamik und Statistische Physik

DY 8: Superfluidity and Bose Einstein Condensation

DY 8.2: Vortrag

Montag, 25. Februar 2008, 17:15–17:30, MA 001

Phase diagram for interacting Bose gases — •Michael Männel¹, Klaus Morawetz^1,2, and Michael Schreiber¹ — ¹Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — ²Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany

From the many-body T-matrix we obtain the condition for a medium-dependent bound state in a Bose gas with contact interaction. This condition, i.e. the phase diagram, is derived from the medium-dependent scattering length and scattering phase as well as from the pole of the T-matrix. Also the binding energy is calculated. By separating the Bose pole from the distribution function the influence of a Bose condensate is measured too.