T-matrix formulation of impurity scattering in correlated systems

Article

关键词: PAIR-BREAKING;    ZN;    SUPERCONDUCTORS;    CU;    SUBSTITUTION;    YBA2CU3O7;   

DOI  :  10.1103/PhysRevB.53.8704

来源: SCIE

【 摘 要 】

Using a generalized T-matrix description which, in principle, exactly includes Coulomb correlations and potential scattering events, resonant and bound impurity states are discussed. Like in the noninteracting case, the effects of the scattering potential can be divided into different partial-wave channels, exploiting the symmetry of the underlying lattice. Due to Coulomb correlations, bare local (i.e., s-wave) potentials become dynamic and extended, being responsible also for p-, d-wave, etc., scattering effects. Numerically exact results for both the two-dimensional t-J and Hubbard models are used to construct a simple (static) approximation to the effective impurity potential which is shown to reproduce the exact resonant scattering and bound states in the relevant symmetry channels.

【 授权许可】

Free