Degeneracy of the ground states at half-filling and the existence of the η-pairing off-diagonal long-range order in the negative-U Hubbard models

Tian, G.-S.

Amsterdam : Elsevier

ISSN:	0038-1098
Source:	Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
Topics:	Physics
Type of Medium:	Electronic Resource
URL:	http://linkinghub.elsevier.com/retrieve/pii/0038-1098(94)90255-0