Ferromagnetic Instability for single-band Hubbard model in the strong-coupling regime

Abstract

We study a ferromagnetic instability in a doped single-band Hubbard model by means of dynamical mean-field theory with the continuous-time quantum Monte Carlo simulations. Examining the effect of the strong correlations in the system on the hypercubic and Bethe lattice, we find that the ferromagnetically ordered state appears in the former, while it does not in the latter. We also reveal that the ferromagnetic order is more stable in the case that the noninteracting DOS exhibits a slower decay in the high-energy region. The present results suggest that, in the strong-coupling regime, the high-energy part of DOS plays an essential role for the emergence of the ferromagnetically ordered state, in contrast to the Stoner criterion justified in the weak interaction limit.

6 pages, 9 figures

References in corpus (6)

• Continuous-time Monte Carlo methods for quantum impurity models
• The numerical renormalization group method for quantum impurity systems
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Flat-Band Ferromagnetism as a Pauli-Correlated Percolation Problem
• Antiferromagnetic order in the Hubbard Model on the Penrose Lattice
• Variational cluster approach to ferromagnetism in infinite dimensions and in one-dimensional chains