Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Ultra-cold atoms, ions and BEC (with A)
Q 12.4: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Dynamical Mean-Field Theory of the SU(4)-symmetric Fermi-Hubbard model and its extensions — •Anna Golubeva1, Agnieszka Cichy1, Andrii Sotnikov2, and Walter Hofstetter1 — 1Goethe Universität, Frankfurt am Main, Germany — 2Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine
Alkaline-earth-like atoms have emerged in the field of ultracold quantum gases as a promising alternative to alkali atoms. Their internal structure includes low-lying metastable electronic states offering the possibility to simulate many-body models with orbital phenomena. Furthermore, certain isotopes (specifically 87Sr, 173Yb) exhibit a high SU(N) symmetry of interactions which is a result of the decoupling between the nuclear spin and electronic degrees of freedom. Recent experimental advances in this field [1–3] have triggered theoretical interest.
We investigate the SU(4)-symmetric Fermi-Hubbard model in a simple cubic optical lattice at finite temperatures. By means of Dynamical Mean-Field Theory [4] and its real-space extension we study the magnetic phases and entropy characteristics of the system at half- and quarter-filling. We also analyze the influence of different interspecies interactions on possible magnetic orderings.
[1] Taie et al., Nature Phys. 8, 825–830 (2012)
[2] Taie et al., Phys. Rev. Lett. 105, 190401 (2010)
[3] Fukuhara et al., Phys. Rev. A 79, 021601 (2009)
[4] Georges et al., Rev. Mod. Phys. 68, 13 (1996)