Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...
TT 37.13: Vortrag
Mittwoch, 16. März 2011, 17:30–17:45, HSZ 105
(contribution withdrawn) BCS-BEC crossover of a spin-imbalanced Fermi gas in one dimension — •Fabian Heidrich-Meisner1, Adrian Feiguin2, Ulrich Schollwöck1, and Wilhelm Zwerger3 — 1LMU Munich, Germany — 2University of Wyoming, Laramie, USA — 3TU Munich, Germany
We present a numerical study of the one-dimensional BCS-BEC crossover of a spin-imbalanced Fermi gas [1]. The crossover is described by the Bose-Fermi resonance model in a real space representation. Our main interest is in the behavior of the s-wave pair correlations, which, in the BCS limit, are of the Fulde-Ferrell-Larkin-Ovchinnikov type, while in the BEC limit, a superfluid of diatomic molecules forms that exhibits quasi-condensation at zero momentum. We use the density matrix renormalization group method to compute the phase diagram as a function of the detuning of the molecular level and the polarization. As a main result, we show that FFLO-like correlations disappear well below full polarization close to the resonance. The critical polarization depends on both the detuning and the filling.
Heidrich-Meisner, Feiguin, Schollwöck, Zwerger Phys. Rev. A 81, 023629 (2010).