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Article: Photon sidebands of the ground state and the excited state of a quantum dot: A nonequilibrium Green-function approach

TitlePhoton sidebands of the ground state and the excited state of a quantum dot: A nonequilibrium Green-function approach
Authors
KeywordsPhysics
Issue Date1998
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter), 1998, v. 58 n. 19, p. 13007-13014 How to Cite?
AbstractThe electron tunneling through an ultrasmall quantum dot in the presence of time-dependent microwave (MW) fields is studied. In the investigation, two single electronic states (the ground state and the excited state) and the intradot Coulomb interaction are considered. Assuming the tunneling through the system as a coherent process, the time-dependent current and the average current are derived using the nonequilibrium Green-function method. Then we consider two special cases with ħω>Δε and ħω<Δε, respectively, where ω is the frequency of MW fields and Δε is the energy difference between two electronic states. Both the sidebands of the photon-assisted tunneling originated from the ground state, and, in particular, from the excited state are obtained, which is in good agreement with the recent experiment by Oosterkamp et al. [Phys. Rev. Lett. 78, 1536 (1997)]. Moreover, the dependence of the integrated average current on the intensity of MW fields is also discussed, and attributed to the many-body effect of the quantum dot.
Persistent Identifierhttp://hdl.handle.net/10722/43246
ISSN
2001 Impact Factor: 3.07
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSun, Qen_HK
dc.contributor.authorWang, Jen_HK
dc.contributor.authorLin, THen_HK
dc.date.accessioned2007-03-23T04:42:06Z-
dc.date.available2007-03-23T04:42:06Z-
dc.date.issued1998en_HK
dc.identifier.citationPhysical Review B (Condensed Matter), 1998, v. 58 n. 19, p. 13007-13014en_HK
dc.identifier.issn0163-1829en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43246-
dc.description.abstractThe electron tunneling through an ultrasmall quantum dot in the presence of time-dependent microwave (MW) fields is studied. In the investigation, two single electronic states (the ground state and the excited state) and the intradot Coulomb interaction are considered. Assuming the tunneling through the system as a coherent process, the time-dependent current and the average current are derived using the nonequilibrium Green-function method. Then we consider two special cases with ħω>Δε and ħω<Δε, respectively, where ω is the frequency of MW fields and Δε is the energy difference between two electronic states. Both the sidebands of the photon-assisted tunneling originated from the ground state, and, in particular, from the excited state are obtained, which is in good agreement with the recent experiment by Oosterkamp et al. [Phys. Rev. Lett. 78, 1536 (1997)]. Moreover, the dependence of the integrated average current on the intensity of MW fields is also discussed, and attributed to the many-body effect of the quantum dot.en_HK
dc.format.extent215121 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). Copyright © American Physical Society.en_HK
dc.subjectPhysicsen_HK
dc.titlePhoton sidebands of the ground state and the excited state of a quantum dot: A nonequilibrium Green-function approachen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0163-1829&volume=58&issue=19&spage=13007&epage=13014&date=1998&atitle=Photon+sidebands+of+the+ground+state+and+the+excited+state+of+a+quantum+dot:+A+nonequilibrium+Green-function+approachen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.58.13007en_HK
dc.identifier.scopuseid_2-s2.0-0344953425-
dc.identifier.hkuros38934-
dc.identifier.isiWOS:000077295500077-

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