Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.28: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Real-Space Dynamical Mean-Field Theory of the SU(4)-symmetric fermionic Hubbard model and its extensions. Magnetic orderings and Hund’s coupling. — •Agnieszka Cichy1, Andrii Sotnikov2, and Walter Hofstetter11Goethe Universität, Frankfurt a. M., Germany — 2Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine

The impressive development of experimental techniques in ultracold quantum degenerate gases of alkaline-earth atoms in the last years has allowed investigation of strongly correlated systems. Long-lived metastable states in combination with a decoupled nuclear spin give the opportunity to study Hamiltonians beyond the possibilities of current alkali-based experiments such as: two-band Hubbard models, the Kondo lattice model as well as SU(N)-symmetric magnetic systems. From the experimental point of view Ytterbium is the most appropriate due to its large number of bosonic and fermionic (e.g. 173Yb) isotopes with a wide range of interaction strengths. We study finite-temperature properties of four-component mixtures of ultracold fermions within the repulsive (U>0) Hubbard model, on the simple cubic lattice. We use the Real-Space Dynamical Mean-Field method, mostly for the half-filling case and at intermediate and strong couplings. We also investigate the case of different interspecies interactions and its influence on the possible magnetic orderings. Finally, we study the role of Hund’s coupling (exchange interaction) in finite temperature magnetic phases, within two-band Hubbard model.

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