Quantum Monte Carlo results for bipolaron stability in quantum dots

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Bipolaron formation in a two-dimensional lattice with harmonic confinement, representing a simplified model for a quantum dot, is investigated by means of quantum Monte Carlo simulations. This method treats all interactions exactly and takes into account quantum lattice fluctuations. Calculations of the bipolaron binding energy reveal that confinement opposes bipolaron formation for weak electron-phonon coupling, but abets a bound state at intermediate to strong coupling. Tuning the system from weak to strong confinement gives rise to a small reduction of the minimum Frohlich coupling parameter for the existence of a bound state.
5 pages, 2 figures, final version to appear in Phys. Rev. B

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Strongly Correlated Electrons, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/140665

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0707.1770
 http://arxiv.org/abs/0707.1770
 Phys. Rev. B 76, 155122 (2007)
 doi:10.1103/PhysRevB.76.155122

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arXiv