Spin-charge separation and simultaneous spin and charge Kondo effect

Details Spin-charge separation and simultaneous spin and charge Kondo effect Spin-charge separation and simultaneous spin and charge Kondo effect

2006-12-15

arxiv.org/abs/cond-mat/0612398v1

Phys. Rev. B 74, 224411 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 11 figures

Scientific paper

10.1103/PhysRevB.74.224411

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.

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