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Article: Resonant Andreev reflection in a normal-metal–quantum-dot–superconductor system

TitleResonant Andreev reflection in a normal-metal–quantum-dot–superconductor system
Authors
KeywordsPhysics
Issue Date1999
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 1999, v. 59 n. 5, p. 3831-3840 How to Cite?
AbstractWe investigate the electron tunneling through a normal-metal–quantum-dot–superconductor (N-QD-S) system where multiple discrete levels of the QD are considered. By using the nonequilibrium-Green’s-function method, the current I and the probability of the Andreev reflection TA(ω) are derived and studied in detail. In addition to the resonant behavior of the Andreev tunneling as obtained in previous works, we find that the current I versus the gate voltage vg exhibits different kinds of peaks, depending on the bias voltage, the level spacing of the QD, and the energy gap of the superconducting electrode. Besides, in I-V characteristics extra peaks superimposed on the conventional current plateaus emerge, which stem from the resonant Andreev reflections. In the case with strongly asymmetric barriers, the BCS spectral density can be obtained directly from the I-V characteristics.
Persistent Identifierhttp://hdl.handle.net/10722/43285
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSun, Qen_HK
dc.contributor.authorWang, Jen_HK
dc.contributor.authorLin, THen_HK
dc.date.accessioned2007-03-23T04:42:52Z-
dc.date.available2007-03-23T04:42:52Z-
dc.date.issued1999en_HK
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 1999, v. 59 n. 5, p. 3831-3840en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43285-
dc.description.abstractWe investigate the electron tunneling through a normal-metal–quantum-dot–superconductor (N-QD-S) system where multiple discrete levels of the QD are considered. By using the nonequilibrium-Green’s-function method, the current I and the probability of the Andreev reflection TA(ω) are derived and studied in detail. In addition to the resonant behavior of the Andreev tunneling as obtained in previous works, we find that the current I versus the gate voltage vg exhibits different kinds of peaks, depending on the bias voltage, the level spacing of the QD, and the energy gap of the superconducting electrode. Besides, in I-V characteristics extra peaks superimposed on the conventional current plateaus emerge, which stem from the resonant Andreev reflections. In the case with strongly asymmetric barriers, the BCS spectral density can be obtained directly from the I-V characteristics.en_HK
dc.format.extent224234 bytes-
dc.format.extent25600 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.subjectPhysicsen_HK
dc.titleResonant Andreev reflection in a normal-metal–quantum-dot–superconductor systemen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=59&issue=5&spage=3831&epage=3840&date=1999&atitle=Resonant+Andreev+reflection+in+a+normal-metal–quantum-dot–superconductor+systemen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.59.3831en_HK
dc.identifier.scopuseid_2-s2.0-0000872423-
dc.identifier.isiWOS:000078699300083-

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