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Article: Response time of a normal-metal/superconductor hybrid system under a step-like pulse bias

TitleResponse time of a normal-metal/superconductor hybrid system under a step-like pulse bias
Authors
KeywordsPhysics
Issue Date2007
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2007, v. 75 n. 12, p. 125308-1 - 125308-8 How to Cite?
AbstractThe response of a quantum dot coupled with one normal lead and a superconductor lead driven by a step-like pulse bias VL is studied using the nonequilibrium Green's function method. In the linear pulse bias regime, the responses of the upward and downward biases are symmetric. In this regime, the turn-on time and turn-off time are much slower than those of the normal system due to the Andreev reflection. On the other hand, for the large pulse bias VL, the instantaneous current exhibits oscillatory behaviors with the frequency hΩ=qVL. The turn-on/off times are in (or shorter than) the scale of 1/VL, so they are faster for the larger bias VL. In addition, the responses for the upward and downward biases are asymmetric at large VL. The turn-on time is larger than the turn-off time, but the relaxation time depends only on the coupling strength and it is much smaller than the turn-on/off times for the large bias VL. [The turn-on/off time describes how fast a device can turn on/off a current, which is also named rise/fall time in M. Plihal et al., Phys. Rev. B 61, R13341 (2000), while the relaxation time was referred to how fast the device can go to a new steady state after a bias is abruptly switched on. It is also named saturation time in A. Schiller and S. Hershfield, Phys. Rev. B 62, R (2000).]
Persistent Identifierhttp://hdl.handle.net/10722/57339
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXing, Yen_HK
dc.contributor.authorSun, QFen_HK
dc.contributor.authorWang, Jen_HK
dc.date.accessioned2010-04-12T01:33:30Z-
dc.date.available2010-04-12T01:33:30Z-
dc.date.issued2007en_HK
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2007, v. 75 n. 12, p. 125308-1 - 125308-8en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57339-
dc.description.abstractThe response of a quantum dot coupled with one normal lead and a superconductor lead driven by a step-like pulse bias VL is studied using the nonequilibrium Green's function method. In the linear pulse bias regime, the responses of the upward and downward biases are symmetric. In this regime, the turn-on time and turn-off time are much slower than those of the normal system due to the Andreev reflection. On the other hand, for the large pulse bias VL, the instantaneous current exhibits oscillatory behaviors with the frequency hΩ=qVL. The turn-on/off times are in (or shorter than) the scale of 1/VL, so they are faster for the larger bias VL. In addition, the responses for the upward and downward biases are asymmetric at large VL. The turn-on time is larger than the turn-off time, but the relaxation time depends only on the coupling strength and it is much smaller than the turn-on/off times for the large bias VL. [The turn-on/off time describes how fast a device can turn on/off a current, which is also named rise/fall time in M. Plihal et al., Phys. Rev. B 61, R13341 (2000), while the relaxation time was referred to how fast the device can go to a new steady state after a bias is abruptly switched on. It is also named saturation time in A. Schiller and S. Hershfield, Phys. Rev. B 62, R (2000).]en_HK
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysicsen_HK
dc.titleResponse time of a normal-metal/superconductor hybrid system under a step-like pulse biasen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=75&issue=12&spage=125308&epage=1 &date=2007&atitle=Response+time+of+a+normal-metal/superconductor+hybrid+system+under+a+step-like+pulse+biasen_HK
dc.identifier.emailSun, QF: sunqf@aphy.iphy.ac.cnen_HK
dc.identifier.emailWang, J: jianwang@hkusub.hku.hken_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.75.125308en_HK
dc.identifier.scopuseid_2-s2.0-33947111910-
dc.identifier.hkuros139258-
dc.identifier.isiWOS:000245330200057-
dc.identifier.citeulike8631713-

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