Charged and spin-excitation gaps in half-filled strongly correlated electron systems: A rigorous result

Article

关键词: PERIODIC ANDERSON MODEL;    GROUND-STATE;    ANTIFERROMAGNETIC ORDER;    HUBBARD-MODEL;    SUPERCONDUCTIVITY;    ENERGY;   

DOI  :  10.1103/PhysRevB.58.7612

来源: SCIE

【 摘 要 】

By exploiting the particle-hole symmetries of the Hubbard model, the periodic Anderson model, and the Kondo lattice model at half-filling and by applying a generalized version of Lieb's spin-reflection positivity method, we show that the char,oed gaps of these models are always larger than their spin-excitation gaps. This theorem confirms the previous results derived by either the variational approach or the density-matrix renormalization-group approach. [S0163-1829(98)07336-6].

【 授权许可】

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