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Thermodynamics at the Nanoscale

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Thermodynamics".

Deadline for manuscript submissions: 31 October 2025 | Viewed by 863

Special Issue Editor


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Guest Editor
School of Physical and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
Interests: quantum materials and devices; nanoscale thermodynamics; molecular electronics; solid-state nanopores; quantum sensing; atomically precise engineering

Special Issue Information

 Dear Colleagues,

Quantum electronic devices offer new and exciting ways to study fundamental concepts of thermodynamics down to the level of single electrons. Entropy spectroscopy provides insights into the equilibrium thermodynamic properties of few-electron quantum devices and has the potential to reveal the emergence of exotic states. From primary electron thermometers that sense temperature without the need for calibration to thermoelectric heat engines that operate with an efficiency close to the thermodynamic limit, these devices may also prove essential to heat management in cryogenic quantum computers. The probabilistic nature of quantum electronic devices enables us to probe the deep connections between information, energy, and entropy whilst providing an experimental platform to explore new classes of thermodynamic uncertainty relations and fluctuation theorems. This Special Issue aims to garner cutting-edge research articles and perspectives from the fields of quantum thermodynamics and thermal nanoelectronics.

Prof. Dr. Jan Mol
Guest Editor

Manuscript Submission Information

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Keywords

  • quantum thermodynamics
  • thermal nanoelectronic devices
  • direct entropy measurements
  • quantum heat engines

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Published Papers (2 papers)

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Research

18 pages, 1006 KB  
Article
Thermoelectric Enhancement of Series-Connected Cross-Conjugated Molecular Junctions
by Justin P. Bergfield
Entropy 2025, 27(10), 1040; https://doi.org/10.3390/e27101040 - 6 Oct 2025
Viewed by 332
Abstract
We investigate the thermoelectric response of single-molecule junctions composed of acyclic cross-conjugated molecules, including dendralene analogues and related iso-poly(diacetylene) (iso-PDA) motifs, in which node-possessing repeat units are connected in series. Using many-body quantum transport theory, we show that increasing the number of repeat [...] Read more.
We investigate the thermoelectric response of single-molecule junctions composed of acyclic cross-conjugated molecules, including dendralene analogues and related iso-poly(diacetylene) (iso-PDA) motifs, in which node-possessing repeat units are connected in series. Using many-body quantum transport theory, we show that increasing the number of repeat units leaves the fundamental gap essentially unchanged while giving rise to a split-node spectrum whose cumulative broadening dramatically enhances the thermopower. This form of quantum enhancement can exceed other interference-based mechanisms, such as the coalescence of nodes into a supernode, suggesting new opportunities for scalable quantum-interference–based materials. Although illustrated here with cross-conjugated systems, the underlying principles apply broadly to series-connected architectures hosting multiple interference nodes. Finally, we evaluate the scaling of the electronic figure of merit ZT and the maximum thermodynamic efficiency. Together, these results highlight the potential for split-node-based materials to realize quantum-enhanced thermoelectric response. Full article
(This article belongs to the Special Issue Thermodynamics at the Nanoscale)
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20 pages, 6247 KB  
Article
Quantum Interference Supernodes, Thermoelectric Enhancement, and the Role of Dephasing
by Justin P. Bergfield
Entropy 2025, 27(10), 1000; https://doi.org/10.3390/e27101000 - 25 Sep 2025
Cited by 1 | Viewed by 331
Abstract
Quantum interference can strongly enhance thermoelectric response, with higher-order “supernodes” predicted to yield scalable gains in thermopower and efficiency. A central question, however, is whether such features are intrinsically more fragile to dephasing. Using Büttiker voltage–temperature probes, we establish an order-selection rule: [...] Read more.
Quantum interference can strongly enhance thermoelectric response, with higher-order “supernodes” predicted to yield scalable gains in thermopower and efficiency. A central question, however, is whether such features are intrinsically more fragile to dephasing. Using Büttiker voltage–temperature probes, we establish an order-selection rule: the effective near-node order is set by the lowest among coherent and probe-assisted channels. Supernodes are therefore fragile in an absolute sense because their transmission is parametrically suppressed with order. However, once an incoherent floor dominates, the fractional suppression of thermopower, efficiency, and figure of merit becomes universal and order-independent. Illustrating these principles with benzene- and biphenyl-based junction calculations, we show that the geometry of environmental coupling—through a single orbital or across many—dictates whether coherence is lost by order reduction or by floor building. These results yield general scaling rules for the thermoelectric response of interference nodes under dephasing. Full article
(This article belongs to the Special Issue Thermodynamics at the Nanoscale)
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