期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 24, 期 38, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0953-8984/24/38/385303
关键词
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资金
- Spanish MICINN [FIS2008-04209]
- FP7 project SE2ND
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 (pi 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.
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