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Article: Transient dynamics of molecular devices under a steplike pulse bias

TitleTransient dynamics of molecular devices under a steplike pulse bias
Authors
KeywordsPhysics
Issue Date2010
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2010, v. 81 n. 12 article no. 121103(R) How to Cite?
AbstractWe report first principles investigation of time-dependent current of molecular devices under a step-like pulse. Our results show that although the switch-on time of the molecular device is comparable to the transit time, much longer time is needed to reach the steady state. In reaching the steady state the current is dominated by resonant states below Fermi level. The contribution of each resonant state to the current shows the damped oscillatory behavior with frequency equal to the bias of the step-like pulse and decay rate determined by the life time of the corresponding resonant state. We found that all the resonant states below Fermi level have to be included for accurate results. This indicates that going beyond wideband limit is essential for a quantitative analysis of transient dynamics of molecular devices.
Persistent Identifierhttp://hdl.handle.net/10722/123836
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
Funding AgencyGrant Number
government of HKSARHKU 704308P
Funding Information:

This work was supported by a RGC (Grant No. HKU 704308P) from the government of HKSAR.

Grants

 

DC FieldValueLanguage
dc.contributor.authorWang, B-
dc.contributor.authorXing, Y-
dc.contributor.authorZhang, L-
dc.contributor.authorWang, J-
dc.date.accessioned2010-10-04T04:48:14Z-
dc.date.available2010-10-04T04:48:14Z-
dc.date.issued2010-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2010, v. 81 n. 12 article no. 121103(R)-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/123836-
dc.description.abstractWe report first principles investigation of time-dependent current of molecular devices under a step-like pulse. Our results show that although the switch-on time of the molecular device is comparable to the transit time, much longer time is needed to reach the steady state. In reaching the steady state the current is dominated by resonant states below Fermi level. The contribution of each resonant state to the current shows the damped oscillatory behavior with frequency equal to the bias of the step-like pulse and decay rate determined by the life time of the corresponding resonant state. We found that all the resonant states below Fermi level have to be included for accurate results. This indicates that going beyond wideband limit is essential for a quantitative analysis of transient dynamics of molecular devices.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/-
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysics-
dc.titleTransient dynamics of molecular devices under a steplike pulse biasen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=81&issue=12&spage=121103(R)&epage=&date=2010&atitle=Transient+dynamics+of+molecular+devices+under+a+steplike+pulse+bias-
dc.identifier.emailWang, B: benwb@hku.hk-
dc.identifier.emailXing, Y: xyx@aphy.iphy.ac.cn-
dc.identifier.emailWang, J: jianwang@hkusub.hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.81.121103-
dc.identifier.scopuseid_2-s2.0-77955130381-
dc.identifier.hkuros171517-
dc.identifier.volume81-
dc.identifier.issue12 article no. 121103(R)-
dc.identifier.eissn1550-235X-
dc.identifier.isiWOS:000276248900003-
dc.relation.projectThe first principle study of local heating and heat transport in nano-devices-

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