Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Ultra-cold atoms, ions and BEC I
Q 4.9: Vortrag
Montag, 14. März 2011, 12:30–12:45, BAR 106
Magnetism and Phase Separation in SU(3) Symmetric Multi-species Fermi Mixtures — •Irakli Titvinidze1, Antonio Privitera1,2, Soon-Yong Chang3,4, Sebastian Diehl3, Mikhail Baranov3, Andrew Daley3, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Goethe-Universität, Frankfurt am Main, Germany — 2Dipartimento di Fisica, Università di Roma La Sapienza, Roma, Italy — 3IQOQI of the Austrian Academy of Sciences, Innsbruck, Austria, — 4Department of Physics, The Ohio State University, Columbus, OH 43210, USA
We study the phase diagram of a SU(3) symmetric mixture of three-species fermions in a lattice with attractive interactions and the effect on the mixture of an effective three-body constraint induced by three-body losses. We address the properties of the system in D ≥ 2 by using dynamical mean-field theory and variational Monte Carlo techniques. The phase diagram of the model shows a strong interplay between magnetism and superfluidity. In the absence of three-body constraint (no losses), the system undergoes a phase transition from a color superfluid phase to a trionic phase, which shows additional charge density modulations at half-filling. Outside of the particle-hole symmetric point the color superfluid phase has always a finite polarization, leading to phase separation in systems where the total number of particles in each species is conserved. The three-body constraint strongly disfavors the trionic phase, stabilizing a (fully magnetized) color superfluid phase also at strong coupling. With increase of the temperature we observe a transition to a non-magnetized SU(3) Fermi liquid phase.