Slave rotor theory of antiferromagnetic Hubbard model

Details Slave rotor theory of antiferromagnetic Hubbard model Slave rotor theory of antiferromagnetic Hubbard model

2006-05-10

arxiv.org/abs/cond-mat/0605266v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

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.

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