Neel order in the Hubbard model within spin-charge rotating reference frame approach: crossover from weak to strong coupling

Abstract

The antiferromagnetic phase of two-dimensional (2D) and three-dimensional (3D) Hubbard model with nearest neighbors hopping is studied on a bipartite cubic lattice by means of the quantum SU(2)xU(1) rotor approach that yields a fully self-consistent treatment of the antiferromagnetic state that respects the symmetry properties the model and satisfy the Mermin-Wagner theorem. The collective variables for charge and spin are isolated in the form of the space-time fluctuating U(1) phase field and rotating spin quantization axis governed by the SU(2) symmetry, respectively. As a result interacting electrons appear as a composite objects consisting of bare fermions with attached U(1) and SU(2) gauge fields. An effective action consisting of a spin-charge rotor and a fermionic fields is derived as a function of the Coulomb repulsion U and hopping parameter t. At zero temperature, our theory describes the evolution from a Slater (U<<t) to a Mott-Heisenberg (U>>t) antiferromagnet. The results for zero-temperature sublatice magnetization (2D) and finite temperature (3D) phase diagram of the antiferromagnetic Hubbard model as a function of the crossover parameter U/t are presented and the role of the spin Berry phase in the interaction driven crossover is analyzed.

11 pages, 6 figures

References in corpus (7)

• Quantum Cluster Theories
• Phase diagram of the three-dimensional Hubbard model at half filling
• Efficient calculation of the antiferromagnetic phase diagram of the 3D Hubbard model
• Neel order, ring exchange and charge fluctuations in the half-filled Hubbard model
• Magnetic Phase Diagram of Hubbard Model in Three Dimensions: the Second-Order Local Approximation
• Fermionic functional renormalization group for first-order phase transitions: a mean-field model
• Composite quasiparticles and the "hidden" quantum critical point in the topological transition scenario of high-$T_c$ cuprates

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• Hubbard pair cluster in the external fields. Studies of the polarization and susceptibility
• Hubbard pair cluster in the external fields. Studies of the magnetic properties
• Quantum critical behavior in three-dimensional one-band Hubbard model at half filling
• Effective pairing interaction in the two-dimensional Hubbard model within a spin rotationally invariant approach
• Neel Order and Electron Spectral Functions in the Two-Dimensional Hubbard Model: a Spin-Charge Rotating Frame Approach