A dynamical mean-field theory study of Nagaoka ferromagnetism

Abstract

We revisit Nagaoka ferromagnetism in the U=oo Hubbard model within the dynamical mean-field theory (DMFT) using the recently developed continuous time quantum Monte Carlo method as the impurity solver. The stability of Nagaoka ferromagnetism is studied as a function of the temperature, the doping level, and the next-nearest-neighbor lattice hopping t'. We found that the nature of the phase transition as well as the stability of the ferromagnetic state is very sensitive to the t' hopping. Negative t'=-0.1t stabilizes ferromagnetism up to higher doping levels. The paramagnetic state is reached through a first order phase transition. Alternatively, a second order phase transition is observed at t'=0. Very near half-filling, the coherence temperature T_{coh} of the paramagnetic metal becomes very low and ferromagnetism evolves out of an incoherent metal rather than conventional Fermi liquid. We use the DMFT results to benchmark slave-boson method which might be useful in more complicated geometries.

10 pages, 11 figures

References in corpus (1)

• Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base

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• Magnetic phase diagram of the infinite-U Hubbard model with nearest- and next nearest-neighbor hoppings
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• Bad Metal Behavior and Lifshitz Transition of a Nagaoka Ferromagnet
• Generalized Nagaoka ferromagnetism accompanied by flavor-selective Mott states in an SU($N$) Fermi-Hubbard model