Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2
TT 32.9: Talk
Thursday, March 25, 2010, 16:30–16:45, H18
Multiflavour fermions in optical lattices — •Antonio Privitera1, Irakli Titvinidze1, Soon-Yong Chang2, Andrew Daley2, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt am Main, Germany — 2Institute for Theoretical Physics, University of Innsbruck, and IQOQI, A-6020 Innsbruck, Austria
We study the properties of three-flavor fermions [1,2] in a optical lattice with and without a (dynamically generated) large three-body repulsion. This can be induced in the form of a hard-core constraint by three-body losses [3]. We address the properties of this system by using dynamical mean-field theory and variational Monte Carlo technique. The phase diagram of the system is very rich and shows a strong interplay between magnetization and superfluidity. Without including the three-body repulsion, the system undergoes a quantum phase transition from a color superfluid to a trionic phase [4], which displays additional CDW modulation at half-filling. This transition is washed out when including a large three-body repulsion, in which case the system is always in the superfluid phase. In this latter case the color superfluid shows a strong tendency to fully polarize at strong coupling in marked contrast with the unconstrained case where the unpolarized trionic phase dominates.
[1] T.Ottenstein et al., Phys. Rev. Lett. 101, 203202 (2008)
[2] J. H. Huckans et al. Phys. Rev. Lett. 102, 165302 (2009)
[3] A.Kantian et al., arXiv:0908.3235
[4] A. Rapp et al., Phys. Rev. B 77, 144520 (2008)