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Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

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

A 6.2: Vortrag

Montag, 18. März 2013, 14:15–14:30, F 428

Ultracold fermions in two and three dimensions — •Igor Boettcher1, Sebastian Diehl2,3, Jan Pawlowski1,4, and Christof Wetterich11Institut 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.

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