Power spectrum of electronic heat current fluctuations

Zhan, Fei, Denisov, Sergey and Hanggi, Peter (2013) Power spectrum of electronic heat current fluctuations. Physica Status Solidi (B): Basic Research, 250 11: 2355-2364. doi:10.1002/pssb.201349192


Author Zhan, Fei
Denisov, Sergey
Hanggi, Peter
Title Power spectrum of electronic heat current fluctuations
Journal name Physica Status Solidi (B): Basic Research   Check publisher's open access policy
ISSN 0370-1972
1521-3951
Publication date 2013-11-01
Year available 2013
Sub-type Article (original research)
DOI 10.1002/pssb.201349192
Volume 250
Issue 11
Start page 2355
End page 2364
Total pages 10
Place of publication Weinheim, Germany
Publisher Wiley
Language eng
Formatted abstract
We analyze the fluctuations of an electronic thermal current across an idealized molecular junction. The focus here will be on the spectral features of the resulting heat fluctuations. By use of the Green function method we derive an explicit expression for the frequency-dependent power spectral density of the emerging energy fluctuations. The complex expression simplifies considerably in the limit of zero frequency, yielding the noise intensity of the heat current. The spectral density for the electronic heat fluctuations still depends on the frequency in the zero-temperature limit, assuming different asymptotic behaviors in the low- and high-frequency regions. We further address subtleties and open problems from an experimental view point for measurements of frequency-dependent power spectral densities.

Diagram not included here.

Sketch of a molecular junction setup used in the text. The average heat flow is generated by electrons moving from a hot electrode TL across the molecular junction towards a neighboring cold electrode TR. The inter-electrode electronic level ε0 can be tuned continuously.
Keyword Heat current fluctuation
Molecular junction
Power spectral density
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
 
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