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】

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