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Universal scaling relations for the energies of many-electron Hooke atoms

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli042511
JulkaisuPhysical Review A
Vuosikerta95
Numero4
DOI - pysyväislinkit
TilaJulkaistu - 19 huhtikuuta 2017
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

Tiivistelmä

A three-dimensional harmonic oscillator consisting of N≥2 Coulomb-interacting charged particles, often called a (many-electron) Hooke atom, is a popular model in computational physics for, e.g., semiconductor quantum dots and ultracold ions. Starting from Thomas-Fermi theory, we show that the ground-state energy of such a system satisfies a nontrivial relation: Egs=ωN4/3fgs(βN1/2), where ω is the oscillator strength, β is the ratio between Coulomb and oscillator characteristic energies, and fgs is a universal function. We perform extensive numerical calculations to verify the applicability of the relation. In addition, we show that the chemical potentials and addition energies also satisfy approximate scaling relations. In all cases, analytic expressions for the universal functions are provided. The results have predictive power in estimating the key ground-state properties of the system in the large-N limit, and can be used in the development of approximative methods in electronic structure theory.

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