Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Ultra-cold atoms, ions and BEC
A 12.1: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Low-temperature phases in the two-band Hubbard model realized with ultracold atomic four-component mixtures in optical lattices — •Yeimer Zambrano1, Andrii Sotnikov2, and Agnieszka Cichy1 — 1Adam Mickiewicz University, Poznań, Poland — 2Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine
We study ultracold quantum gases of alkaline-earth-like atoms loaded into three dimensional optical lattice. In particular, we focus on the fermionic mixture of ytterbium-173 atoms due to their unique properties, in particular, low-lying metastable excited (e) electronic state, decoupling of the nuclear spin from the electronic degrees of freedom, and different AC-polarizabilities of the ground- (g-) and e-states. This allows to realize and investigate in detail strongly-correlated many-body physics and emerging low-temperature phases in these mixtures. We focus on the recent realization of the two-band Hubbard model [1,2] and study potential long-rang ordered states. The theoretical analysis is performed in the region of applicability of the tight-binding approximation at different lattice depths and different fillings in the g- and e-bands. By means of dynamical mean-field theory, we obtain dependencies for relevant physical observables, in particular, magnetization, particle density in each band, double occupancy, and compressibility. We construct the phase diagram at finite temeperature and various latice depths.
[1] F. Scazza et al., Nat. Phys. 10, 779 (2014)
[2] L. Riegger et al., Phys. Rev. Lett. 120, 143601 (2018)