Slave rotor theory of antiferromagnetic Hubbard model
Strongly Correlated Electrons
2007-05-23 v1
Abstract
The slave-rotor mean-field theory of Florens and Georges is generalized to the antiferromagnetic phase of the Hubbard model. An effective action consisting of a spin rotor and a fermion is derived and the corresponding saddle-point action is analyzed. Zero-temperature phase diagram of the antiferromagnetic Hubbard model is presented. While the magnetic phase persists for all values of the Hubbard interaction U, the single-particle spectral function exhibits a crossover into an incoherent phase when the magnetic moment m (and the corresponding U values) lies within a certain window m_c < m < 1-m_c, indicating a possible deviation from the Hartree-Fock theory.
Keywords
Cite
@article{arxiv.cond-mat/0605266,
title = {Slave rotor theory of antiferromagnetic Hubbard model},
author = {Ki-Seok Kim and Jung Hoon Han},
journal= {arXiv preprint arXiv:cond-mat/0605266},
year = {2007}
}