Kondo tunneling through real and artificial molecules

Details Kondo tunneling through real and artificial molecules Kondo tunneling through real and artificial molecules

2000-07-19

arxiv.org/abs/cond-mat/0007306v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 two-column revtex pages including 1 eps figure

Scientific paper

10.1103/PhysRevLett.86.2090

When a cerocene molecule is chemisorbed on metallic substrate, or when an asymmetric double dot is hybridized with itinerant electrons, its singlet ground state crosses its lowly excited triplet state, leading to a competition between the Zhang-Rice mechanism of singlet-triplet splitting in a confined cluster and the Kondo effect (which accompanies the tunneling through quantum dot under a Coulomb blockade restriction). The rich physics of an underscreened S=1 Kondo impurity in the presence of low-lying triplet/singlet excitations is exposed. Estimates of the magnetic susceptibility and the electric conductance are presented.

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