Artículos de revistas
Classical Antiferromagnetism in Kinetically Frustrated Electronic Models
Sposetti, Cintia Natalia; Bravo, Barbara; Trumper, Adolfo Emilio; Gazza, Claudio Javier; Manuel, Luis Oscar; Classical Antiferromagnetism in Kinetically Frustrated Electronic Models; American Physical Society; Physical Review Letters; 112; 5-2014; 187204-187204
Sposetti, Cintia Natalia
Trumper, Adolfo Emilio
Gazza, Claudio Javier
Manuel, Luis Oscar
We study, by means of the density matrix renormalization group, the infinite U Hubbard model—with one hole doped away from half filling—in triangular and square lattices with frustrated hoppings, which invalidate Nagaoka’s theorem. We find that these kinetically frustrated models have antiferromagnetic ground states with classical local magnetization in the thermodynamic limit. We identify the mechanism of this kinetic antiferromagnetism with the release of the kinetic energy frustration, as the hole moves in the established antiferromagnetic background. This release can occur in two different ways: by a nontrivial spin Berry phase acquired by the hole, or by the effective vanishing of the hopping amplitude along the frustrating loops.