Response functions of an artificial Anderson atom in the atomic limit

A.T. Alastalo, M.P.V. Stenberg, M.M. Salomaa

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)897-924
Number of pages28
JournalJournal of Low Temperature Physics
Volume134
Issue number3-4
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • Anderson model
  • atom model
  • artificial atom
  • response functions
  • atomic limit

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