Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-03-02
Phys. Rev. A 79, 063602 (2009)
Physics
Condensed Matter
Quantum Gases
10 pages, 15 figures
Scientific paper
10.1103/PhysRevA.79.063602
We discuss the thermodynamics of a non-relativistic gas of bosons with a local repulsive interaction. In particular, we compute the temperature and density dependence of pressure, energy and entropy-density, superfluid and condensate-fraction, correlation length, specific heat, isothermal and adiabatic compressibility and various sound velocities. The T->0 limit approaches the quantum phase transition, while the universal critical behavior of a classical second order phase transition in the O(2) universality class determines the region around the critical temperature. Our non-perturbative flow equations based on exact functional renormalization cover all regions in the phase diagram.
Floerchinger Stefan
Wetterich Christof
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