Slave rotor theory of antiferromagnetic Hubbard model

2006/05/10 by Ki‐Seok Kim, Kim, Ki-Seok, Jung Hoon Han +1 · 1 citation
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Nonlinear Photonic Systems #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.cond-mat/0605266

openalex publication_date 2006/05/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

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