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Type: Artigo de periódico
Title: Short-range interactions in a two-electron system: Energy levels and magnetic properties
Author: da Silva, LGGVD
de Aguiar, MAM
Abstract: The problem of two electrons in a square billiard interacting via a finite-range repulsive Yukawa potential and subjected to a constant magnetic field is considered. We compute the energy spectrum for both singlet and triplet states and for all symmetry classes as a function of the strength and range of the interaction and magnetic field. We show that the short-range nature of the potential suppresses the formation of "Wigner molecule" states for the ground state, even in the strong-interaction limit. The magnetic susceptibility chi(B) shows low-temperature paramagnetic peaks due to exchange induced singlet-triplet oscillations. The position, number, and intensity of these peaks depend on the range and strength of the interaction. The contribution of the interaction to the susceptibility displays paramagnetic and diamagnetic phases as a function of T.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.66.165309
Date Issue: 2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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