Spin-charge separation and simultaneous spin and charge Kondo effect

Article

关键词: NUMERICAL RENORMALIZATION-GROUP;    O(3) SYMMETRIC ANDERSON;    CONFORMAL-FIELD-THEORY;    TRANSPORT-COEFFICIENTS;    MODEL;    IMPURITY;   

DOI  :  10.1103/PhysRevB.74.224411

来源: SCIE

【 摘 要 】

We study the spin-charge separation in a Kondo-like model for an impurity with a spin and a charge (isospin) degree of freedom coupled to a single conduction channel (the spin-charge Kondo model). We show that the spin and charge Kondo effects can occur simultaneously at any coupling strength. In the continuum (wide-band or weak coupling) limit, the Kondo screening in each sector is independent, while at finite bandwidth and strong coupling the lattice effects lead to a renormalization of the effective Kondo exchange constants; nevertheless, universal spin and charge Kondo effects still occur. We find similar behavior in the two-impurity Anderson model with positive and negative electron-electron interaction and in the two-impurity Anderson-Holstein model with a single phonon mode. We comment on the applicability of such models to describe the conductance of deformable molecules with a local magnetic moment.

【 授权许可】

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