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The Andreev states of a superconducting quantum dot: Mean field versus exact numerical results
Entidad
UAM. Departamento de Física Teórica de la Materia CondensadaEditor
Institute of Physics Publishing (IOP)Fecha de edición
2012-09-26Cita
10.1088/0953-8984/24/38/385303
Journal of Physics: Condensed Matter 24.38 (2012): 385303
ISSN
0953-8984 (print); 1361-648X (online)DOI
10.1088/0953-8984/24/38/385303Financiado por
Financial support from Spanish MICINN through project FIS2008-04209 and FP7 project SE2ND is acknowledgedProyecto
Gobierno de España. FIS2008-04209; info:eu-repo/grantAgreement/EC/FP7/271554Versión del editor
http://dx.doi.org/10.1088/0953-8984/24/38/385303Materias
74.50.+r; 74.45.+c; 73.63.Kv; 72.15.Qm; FísicaNota
This is the peer reviewed version of the following article: Journal of Physics: Condensed Matter 24.38 (2012): 385303, which has been published in final form at http://dx.doi.org/10.1088/0953-8984/24/38/385303Derechos
© 2012 IOP Publishing Ltd.Resumen
We analyze the spectral density of a single level quantum dot coupled to superconducting leads focusing on the Andreev states appearing within the superconducting gap. We use two complementary approaches: the numerical renormalization group and the Hartree–Fock approximation. Our results show the existence of up to four bound states within the gap when the ground state is a spin doublet (π phase). Furthermore the results demonstrate the reliability of the mean field description within this phase. This is understood from a complete correspondence that can be established between the exact and the mean field quasiparticle excitation spectrum within the gap
Lista de ficheros
Google Scholar:Martín-Rodero, A.
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Levy-Yeyati Mizrahi, Alfredo
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