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

Fingerprint

Atoms
Excitation energy
atoms
oscillator strengths
excitation
degrees of freedom
asymmetry
deviation
Temperature
temperature
energy

Keywords

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

Cite this

Alastalo, A.T. ; Stenberg, M.P.V. ; Salomaa, M.M. / Response functions of an artificial Anderson atom in the atomic limit. In: Journal of Low Temperature Physics. 2004 ; Vol. 134, No. 3-4. pp. 897-924.
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Response functions of an artificial Anderson atom in the atomic limit. / Alastalo, A.T.; Stenberg, M.P.V.; Salomaa, M.M.

In: Journal of Low Temperature Physics, Vol. 134, No. 3-4, 2004, p. 897-924.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Response functions of an artificial Anderson atom in the atomic limit

AU - Alastalo, A.T.

AU - Stenberg, M.P.V.

AU - Salomaa, M.M.

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

KW - Anderson model

KW - atom model

KW - artificial atom

KW - response functions

KW - atomic limit

U2 - 10.1023/B:JOLT.0000013208.27930.57

DO - 10.1023/B:JOLT.0000013208.27930.57

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SP - 897

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JO - Journal of Low Temperature Physics

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