Failure of standard approximations of the exchange coupling in nanostructures

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dc.creatorPedersen, Jesper
dc.creatorFlindt, Christian
dc.creatorMortensen, Niels Asger
dc.creatorJauho, Antti-Pekka
dc.date2007-06-13
dc.date2007-10-03
dc.date.accessioned2026-07-07T08:33:26Z
dc.date.available2026-07-07T08:33:26Z
dc.descriptionWe calculate the exchange coupling for a double dot system using a novel, numerically exact yet efficient technique, based on finite-element methods. Specifically, we evaluate the exchange coupling both for a quasi-one and a two-dimensional system, also including an applied magnetic field. Our numerical results provide a stringent test for standard approximation schemes (e.g., Heitler-London, Hund-Mulliken, Hubbard), and they show that the standard methods do not have reliable predictive power for real quantum-dot systems.
dc.description7 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0706.1859
dc.identifierhttp://arxiv.org/abs/0706.1859
dc.identifierPhys. Rev. B 76, 125323 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.125323
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139131
dc.subjectMesoscale and Nanoscale Physics
dc.titleFailure of standard approximations of the exchange coupling in nanostructures
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