Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 6: Ultra-cold atoms, ions and BEC II (with Q)

A 6.2: Talk

Monday, March 18, 2013, 14:15–14:30, F 428

Ultracold fermions in two and three dimensions — •Igor Boettcher¹, Sebastian Diehl^2,3, Jan Pawlowski^1,4, and Christof Wetterich¹ — ¹Institut fuer Theoretische Physik, Universitaet Heidelberg — ²Institut fuer Theoretische Physik, Universitaet Innsbruck — ³IQOQI, Innsbruck — ⁴ExtreMe Matter Insitute EMMI, GSI Darmstadt

The increasing experimental advances in realizing ultracold atom ensembles constitute an unprecedented possibility for testing and constraining predictions from quantum field theory. Key observables in equilibrium are the equation of state and the phase diagram of the system. I will present results on the BCS-BEC crossover of two-component ultracold fermions in both two and three dimensions, obtained with the Functional RG. We aim at quantitative precision. For this purpose we incorporate renormalization effects like the Contact, which is related to the high energy behavior of the momentum distribution of particles, and study its influence on the thermodynamics. The two-dimensional case is particularly interesting due to strong quantum fluctuations and can be realized in experiment with highly anisotropic traps.