Power spectrum of electronic heat current fluctuations. Issue 11 (21st August 2013)

• Record Type: Journal Article
• Authors: Zhan, Fei; Denisov, Sergey; Hänggi, Peter; Frauenheim, Thomas; Niehaus, Thomas; Repp, Jascha; Richter, Klaus; Weber, Heiko
• Is Part Of: Physica status solidi. Volume 250:Issue 11(2013:Nov.)
• Page Start: 2355
• Page End: 2364
• Publication Date: 2013-08-21
• Subjects: Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201349192
• Languages: English
• ISSNs: 0370-1972

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssb201349192-sec-0001" sec-type="section"> <p>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.</p> <p> <inline-graphic xlink:href="ark:/27927/pgg3v1brsnd" content-type="pssb201349192-gra-0001" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /> </p> <p>Sketch of a molecular junction setup used in the text. The average heat flow is generated by electrons moving from a hot electrode <alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgg3v1bprs4" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201349192:pssb201349192-math-0001" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>T</mml:mi><mml:mi mathvariant="normal">L</mml:mi></mml:msub></mml:math></alternatives> across the molecular junction towards a neighboring cold electrode <alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgg3v1bprnx" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201349192:pssb201349192-math-0002" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>T</mml:mi><mml:mi mathvariant="normal">R</mml:mi></mml:msub></mml:math></alternatives>. The inter‐electrode electronic level <alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgg3v1bprpg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201349192:pssb201349192-math-0003" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>ϵ</mml:mi><mml:mn>0</mml:mn></mml:msub></mml:math></alternatives> can be tuned continuously.</p> </sec> </abstract>