Ferromagnetism of cold fermions loaded into a decorated square lattice

Details Ferromagnetism of cold fermions loaded into a decorated square lattice Ferromagnetism of cold fermions loaded into a decorated square lattice

2010-04-26

arxiv.org/abs/1004.4650v1

Physical Review A 80, 063622 (2009)

Physics

Condensed Matter

Quantum Gases

8 pages, 7 figures

Scientific paper

We investigate two-component ultracold fermions loaded into a decorated square lattice, which are described by the Hubbard model with repulsive interactions and nearest neighbor hoppings. By combining the real-space dynamical mean-field theory with the numerical renormalization group method, we discuss how a ferromagnetically ordered ground state in the weak coupling regime, which originates from the existence of a dispersionless band, is adiabatically connected to a Heisenberg ferrimagnetic state in the strong coupling limit. The effects of level splitting and hopping imbalance are also addressed.

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