Response functions of an artificial Anderson atom in the atomic limit

Details Response functions of an artificial Anderson atom in the atomic limit Response functions of an artificial Anderson atom in the atomic limit

2003-08-20

arxiv.org/abs/cond-mat/0308400v1

J. Low Temp. Phys. 134, 897 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

23 pages, 12 figures. Accepted for publication in J. Low Temp. Phys

Scientific paper

10.1023/B:JOLT.0000013208.27930.

We consider the spin and pseudospin (charge) response functions of the exactly soluble Anderson atom model. We demonstrate, in particular, that a deviation from the magnetic Curie-law behaviour, appropriate for a free spin one-half, increases with increasing asymmetry and temperature. In general, oscillator strength is transferred from the spin degrees of freedom to the pseudospin modes. We also consider the negative-U Anderson atom and demonstrate that the pseudospin modes are the relevant low-energy excitations in this case. Especially, the roles of the spin and charge excitations are interchanged upon reversal of the intrasite Coulomb repulsion, U.

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