We solve analytically the N×N square lattice Hubbard model for even N at half-filling and weak coupling by a new approach. The exact ground-state wave function provides an intriguing and appealing picture of the antiferromagnetic order. Like at strong coupling, the ground state has total momentum Ktot=(0,0) and transforms as an s wave for even N/2 and as a d wave otherwise.
Cini, M., Stefanucci, G. (2001). Exact ground state of the two-dimensional Hubbard model at half-filling for U=0(+). SOLID STATE COMMUNICATIONS, 117(8), 451-454 [10.1016/S0038-1098(00)00504-4].
Exact ground state of the two-dimensional Hubbard model at half-filling for U=0(+)
CINI, MICHELE;STEFANUCCI, GIANLUCA
2001-01-01
Abstract
We solve analytically the N×N square lattice Hubbard model for even N at half-filling and weak coupling by a new approach. The exact ground-state wave function provides an intriguing and appealing picture of the antiferromagnetic order. Like at strong coupling, the ground state has total momentum Ktot=(0,0) and transforms as an s wave for even N/2 and as a d wave otherwise.File in questo prodotto:
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