Molecular wires acting as quantum heat ratchets

Zhan, Fei, Li, Nianbei, Kohler, Sigmund and Haenggi, Peter (2009) Molecular wires acting as quantum heat ratchets. Physical Review E, 80 6: . doi:10.1103/PhysRevE.80.061115

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Author Zhan, Fei
Li, Nianbei
Kohler, Sigmund
Haenggi, Peter
Title Molecular wires acting as quantum heat ratchets
Journal name Physical Review E   Check publisher's open access policy
ISSN 1539-3755
Publication date 2009-12
Sub-type Article (original research)
DOI 10.1103/PhysRevE.80.061115
Open Access Status File (Publisher version)
Volume 80
Issue 6
Total pages 9
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We explore heat transfer in molecular junctions between two leads in the absence of a finite net thermal bias. The application of an unbiased time-periodic temperature modulation of the leads entails a dynamical breaking of reflection symmetry, such that a directed heat current may emerge (ratchet effect). In particular, we consider two cases of adiabatically slow driving, namely, (i) periodic temperature modulation of only one lead and (ii) temperature modulation of both leads with an ac driving that contains a second harmonic, thus, generating harmonic mixing. Both scenarios yield sizable directed heat currents, which should be detectable with present techniques. Adding a static thermal bias allows one to compute the heat current-thermal load characteristics, which includes the ratchet effect of negative thermal bias with positive-valued heat flow against the thermal bias, up to the thermal stop load. The ratchet heat flow in turn generates also an electric current. An applied electric stop voltage, yielding effective zero electric current flow, then mimics a solely heat-ratchet-induced thermopower (“ratchet Seebeck effect”), although no net thermal bias is acting. Moreover, we find that the relative phase between the two harmonics in scenario (ii) enables steering the net heat current into a direction of choice.
Keyword Heat transfer
Molecular electronics
Seebeck effect
Thermoelectric power
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 061115.

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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