Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 63: Low-Dimensional Systems: 2D - Theory
TT 63.4: Talk
Thursday, March 10, 2016, 10:15–10:30, H21
Thermodynamics and renormalized quasiparticles in the vicinity of the dilute Bose gas quantum critical point in two dimensions — •Jan Krieg1, Simon Streib1, Dominik Straßel2, Sebastian Eggert2, and Peter Kopietz1 — 1Goethe-Universität Frankfurt, Deutschland — 2Technische Universität Kaiserslautern, Deutschland
Using the functional renormalization group and quantum Monte Carlo methods we investigate the region close to the quantum critical point of a dilute two-dimensional boson gas in the normal phase. Decoupling the two-particle interaction in the particle-particle channel and using a simple truncation of the flow equations we derive the leading order logarithmic corrections to pressure, density, and entropy as well as to the effective mass and to the wavefunction renormalization. We find that recent experiments using cold atoms are in good agreement with our results.