Ferromagnetism of cold fermions loaded into a decorated square lattice
Quantum Gases
2015-05-18 v1
Abstract
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.
Keywords
Cite
@article{arxiv.1004.4650,
title = {Ferromagnetism of cold fermions loaded into a decorated square lattice},
author = {Kazuto Noda and Akihisa Koga and Norio Kawakami and Thomas Pruschke},
journal= {arXiv preprint arXiv:1004.4650},
year = {2015}
}
Comments
8 pages, 7 figures