期刊论文详细信息
Rigorous results on superconducting ground states for attractive extended Hubbard models | |
Article | |
关键词: SINGLE-BAND MODEL; LONG-RANGE ORDER; CHARGE COULOMB REPULSION; METALLIC FERROMAGNETISM; | |
DOI : 10.1103/PhysRevB.53.5153 | |
来源: SCIE |
【 摘 要 】
We show that the exact ground state for a class of extended Hubbard models including bond-charge, exchange, and pair-hopping terms, is the Yang ''eta-paired'' state for any nonvanishing positive value of the pair-hopping amplitude, at least when the on-site Coulomb interaction is attractive enough and the remaining physical parameters satisfy a single constraint. The ground state is thus rigorously superconducting. Our result holds on a bipartite lattice in any dimension, at any band filling, and for arbitrary electron hopping.
【 授权许可】
Free