File Download
 
Links for fulltext
(May Require Subscription)
 
Supplementary

Article: Enhancement of shot noise due to the fluctuation of Coulomb interaction
  • Basic View
  • Metadata View
  • XML View
TitleEnhancement of shot noise due to the fluctuation of Coulomb interaction
 
AuthorsLi, D1
Zhang, L1
Xu, F1
Wang, J1
 
Issue Date2012
 
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
 
CitationPhysical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 16, article no. 165402 [How to Cite?]
DOI: http://dx.doi.org/10.1103/PhysRevB.85.165402
 
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.
 
ISSN1098-0121
2012 Impact Factor: 3.767
2012 SCImago Journal Rankings: 2.393
 
DOIhttp://dx.doi.org/10.1103/PhysRevB.85.165402
 
ISI Accession Number IDWOS:000302236800005
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.

 
GrantsTheoretical investigation of dynamic response, fluctuations, and charge relaxations in disordered mesoscopic conductors.
Theory, Modeling, and Simulation of Emerging Electronics
 
DC FieldValue
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.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.description.naturepublished_or_final_version
 
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 16, article no. 165402 [How to Cite?]
DOI: http://dx.doi.org/10.1103/PhysRevB.85.165402
 
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.85.165402
 
dc.identifier.hkuros199947
 
dc.identifier.isiWOS:000302236800005
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.

 
dc.identifier.issn1098-0121
2012 Impact Factor: 3.767
2012 SCImago Journal Rankings: 2.393
 
dc.identifier.issue16, article no. 165402
 
dc.identifier.scopuseid_2-s2.0-84860299816
 
dc.identifier.urihttp://hdl.handle.net/10722/149042
 
dc.identifier.volume85
 
dc.languageeng
 
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
 
dc.publisher.placeUnited States
 
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)
 
dc.relation.projectTheoretical investigation of dynamic response, fluctuations, and charge relaxations in disordered mesoscopic conductors.
 
dc.relation.projectTheory, Modeling, and Simulation of Emerging Electronics
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.titleEnhancement of shot noise due to the fluctuation of Coulomb interaction
 
dc.typeArticle
 
<?xml encoding="utf-8" version="1.0"?>
<item><contributor.author>Li, D</contributor.author>
<contributor.author>Zhang, L</contributor.author>
<contributor.author>Xu, F</contributor.author>
<contributor.author>Wang, J</contributor.author>
<date.accessioned>2012-06-21T04:15:54Z</date.accessioned>
<date.available>2012-06-21T04:15:54Z</date.available>
<date.issued>2012</date.issued>
<identifier.citation>Physical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 16, article no. 165402</identifier.citation>
<identifier.issn>1098-0121</identifier.issn>
<identifier.uri>http://hdl.handle.net/10722/149042</identifier.uri>
<description.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&apos;s function method. We applied our theory to study the behavior of dc shot noise of atomic junctions, using the method of nonequilibrium Green&apos;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. &#169; 2012 American Physical Society.</description.abstract>
<language>eng</language>
<publisher>American Physical Society. The Journal&apos;s web site is located at http://prb.aps.org/</publisher>
<relation.ispartof>Physical Review B (Condensed Matter and Materials Physics)</relation.ispartof>
<rights>Creative Commons: Attribution 3.0 Hong Kong License</rights>
<title>Enhancement of shot noise due to the fluctuation of Coulomb interaction</title>
<type>Article</type>
<description.nature>published_or_final_version</description.nature>
<identifier.doi>10.1103/PhysRevB.85.165402</identifier.doi>
<identifier.scopus>eid_2-s2.0-84860299816</identifier.scopus>
<identifier.hkuros>199947</identifier.hkuros>
<identifier.volume>85</identifier.volume>
<identifier.issue>16, article no. 165402</identifier.issue>
<identifier.isi>WOS:000302236800005</identifier.isi>
<publisher.place>United States</publisher.place>
<relation.project>Theoretical investigation of dynamic response, fluctuations, and charge relaxations in disordered mesoscopic conductors.</relation.project>
<relation.project>Theory, Modeling, and Simulation of Emerging Electronics</relation.project>
<bitstream.url>http://hub.hku.hk/bitstream/10722/149042/2/content.pdf</bitstream.url>
</item>
Author Affiliations
  1. The University of Hong Kong