Thermoelectric signatures of coherent transport in single-molecule heterojunctions

J. P. Bergfield, Charles A Stafford

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

An exact expression for the heat current in an interacting nanostructure is derived and used to calculate the thermoelectric response of three representative single-molecule junctions formed from isoprene, 1,3-benzenedithiol, and [18]-annulene. Dramatic enhancements of the thermopower S and Lorenz number L are predicted when the junction is tuned across a node in the transmission function, with universal maximum values S max ) (π/3 1/2)(k B/e) and L max ) (7π 2/5)(k B 2/e 2). The effect of a finite minimum transmission probability due, e.g., to incoherent processes or additional nonresonant channels, is also considered.

Original languageEnglish (US)
Pages (from-to)3072-3076
Number of pages5
JournalNano Letters
Volume9
Issue number8
DOIs
StatePublished - Aug 12 2009

Fingerprint

Heterojunctions
heterojunctions
signatures
Isoprene
Molecules
Thermoelectric power
molecules
Nanostructures
heat
augmentation
Hot Temperature
isoprene
1,4-benzenedithiol

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Thermoelectric signatures of coherent transport in single-molecule heterojunctions. / Bergfield, J. P.; Stafford, Charles A.

In: Nano Letters, Vol. 9, No. 8, 12.08.2009, p. 3072-3076.

Research output: Contribution to journalArticle

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