Abstract
Based on quantum Monte Carlo calculations, we shall discuss the regime where ferromagnetic correlation is dominant in the two-dimensional Hubbard model at a finite temperature. In this model, ferromagnetism competes with antiferromagnetism and we reveal how crossover occurs between them at a finite temperature by the bias-free method. We shall investigate the data in the context of the so-called “low-density ferromagnetism.” The weak-coupling result is also shown and the data are compared with the “Nagaoka ferromagnetism.”
4 More- Received 8 March 2004
DOI:https://doi.org/10.1103/PhysRevB.71.134417
©2005 American Physical Society