Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Matter at Low Temperature: Quantum Liquids, Bose-Einstein-Condensates, Ultra-cold Atoms
TT 41.6: Vortrag
Donnerstag, 26. März 2009, 15:15–15:30, HSZ 105
Condensate density of interacting Bosons at finite temperature: A Functional Renormalization Group calculation — •Christopher Eichler1, Nils Hasselmann2, and Peter Kopietz1 — 1Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue-Straße 1, 60348 Frankfurt, Germany — 2International Center for Condensed Matter Physics, Universidade de Brasilia, Caixa Postal 04667, 70910-900 Brasilia,DF, Brazil
We use the Functional Renormalization Group to study thermodynamics of 3-dimensional interacting bosons at finite temperature. Our calculation is based on a truncated vertex expansion and a momentum independent two-body interaction including wave function renormalization. In particular, we derive the renormalization group flow of the condensate density in the symmetry broken phase and explicitly calculate the critical exponent β. Our result for β agrees quite well with the accepted numerical value for the 3-dimensional XY universality class.