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28 March 2024
 
  » arxiv » 0807.1868

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Description of the Electronic Exchange in Quantum Rings
E. Rasanen ; S. Pittalis ; C. R. Proetto ; E. K. U. Gross ;
Date 11 Jul 2008
AbstractQuantum rings can be characterized by a specific radius and ring width. For this rich class of physical systems, an accurate approximation for the exchange-hole potential and thus for the exchange energy is derived from first principles. An excellent agreement with the exact-exchange results is obtained regardless of the ring parameters, total spin, current, or the external magnetic field. The description can be applied as a density functional outperforming the commonly used local-spin-density approximation, which is here explicitly shown to break down in the quasi-one-dimensional limit.
Source arXiv, 0807.1868
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