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Article: Enhancement of shot noise due to the fluctuation of Coulomb interaction

TitleEnhancement of shot noise due to the fluctuation of Coulomb interaction
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 16, article no. 165402 How to Cite?
Abstract
For a resonant tunneling structure, it was found experimentally that the shot noise is super-Poissonian in the negative differential region (NDR). From a semiclassical analysis, it is believed that the super-Poissonian behavior is due to fluctuation of the Coulomb interaction. Although there are many studies on shot noise in mesocopic or nanoscale systems, an accounting by first-principles quantum transport theory for super-Poissonian behavior in the NDR is still lacking. In this paper, we develop a theoretical formalism to investigate the contribution of fluctuations of the Coulomb interaction to the shot noise, based on the Keldysh nonequilibrium Green's function method. We applied our theory to study the behavior of dc shot noise of atomic junctions, using the method of nonequilibrium Green's functions combined with density functional theory (NEGF-DFT). In particular, for an atomic carbon wire consisting of four carbon atoms in contact with two Al(100) electrodes, a first-principles calculation within the NEGF-DFT formalism shows a NDR region in the I-V curve at finite bias due to the effective band bottom of the Al lead. We calculated the shot noise spectrum using our theory. Our numerical result shows super-Poissonian behavior with a Fano factor larger than 1 in the NDR region, in agreement with the experimental result. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/149042
ISSN
2013 Impact Factor: 3.664
2013 SCImago Journal Rankings: 2.143
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant CouncilHKU 705409P
University Grant Council of the Government of HKSARAoE/P-04/08
Funding Information:

We thank Dr. Y. X. Xing for checking all the algebra in the theory part of the paper. This work was financially supported by the Research Grant Council (Grant No. HKU 705409P) and the University Grant Council (Contract No. AoE/P-04/08) of the Government of HKSAR.

Grants

 

Author Affiliations
  1. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorLi, D-
dc.contributor.authorZhang, L-
dc.contributor.authorXu, F-
dc.contributor.authorWang, J-
dc.date.accessioned2012-06-21T04:15:54Z-
dc.date.available2012-06-21T04:15:54Z-
dc.date.issued2012-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 16, article no. 165402-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/149042-
dc.description.abstractFor a resonant tunneling structure, it was found experimentally that the shot noise is super-Poissonian in the negative differential region (NDR). From a semiclassical analysis, it is believed that the super-Poissonian behavior is due to fluctuation of the Coulomb interaction. Although there are many studies on shot noise in mesocopic or nanoscale systems, an accounting by first-principles quantum transport theory for super-Poissonian behavior in the NDR is still lacking. In this paper, we develop a theoretical formalism to investigate the contribution of fluctuations of the Coulomb interaction to the shot noise, based on the Keldysh nonequilibrium Green's function method. We applied our theory to study the behavior of dc shot noise of atomic junctions, using the method of nonequilibrium Green's functions combined with density functional theory (NEGF-DFT). In particular, for an atomic carbon wire consisting of four carbon atoms in contact with two Al(100) electrodes, a first-principles calculation within the NEGF-DFT formalism shows a NDR region in the I-V curve at finite bias due to the effective band bottom of the Al lead. We calculated the shot noise spectrum using our theory. Our numerical result shows super-Poissonian behavior with a Fano factor larger than 1 in the NDR region, in agreement with the experimental result. © 2012 American Physical Society.-
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.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleEnhancement of shot noise due to the fluctuation of Coulomb interactionen_US
dc.typeArticleen_US
dc.identifier.emailXu, F: fumingxu@hku.hk-
dc.identifier.emailWang, J: jianwang@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.85.165402-
dc.identifier.scopuseid_2-s2.0-84860299816-
dc.identifier.hkuros199947-
dc.identifier.volume85-
dc.identifier.issue16, article no. 165402-
dc.identifier.isiWOS:000302236800005-
dc.publisher.placeUnited States-
dc.relation.projectTheoretical investigation of dynamic response, fluctuations, and charge relaxations in disordered mesoscopic conductors.-
dc.relation.projectTheory, Modeling, and Simulation of Emerging Electronics-

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