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Abstract: We report simple expressions for the exchange coupling in double quantum dotscalculated within the Heitler-London and the Hund-Mulliken approximations usingfour different confining potentials. At large interdot distances and at largemagnetic fields the exchange coupling does not depend significantly on thedetails of the potentials. In contrast, at low fields and short distancesdifferent behaviors of the exchange coupling can be attributed to particularfeatures of the potentials. Our results may be useful as guidelines innumerical studies and in the modeling of experiments.



Autor: Jesper G. Pedersen, Christian Flindt, Antti-Pekka Jauho, Niels Asger Mortensen

Fuente: https://arxiv.org/



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