Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

A Thermodynamic Approach to Measuring Entropy in a Few-Electron Nanodevice

Version 1 : Received: 21 April 2021 / Approved: 22 April 2021 / Online: 22 April 2021 (13:29:10 CEST)

How to cite: Pyurbeeva, E.; Mol, J. A Thermodynamic Approach to Measuring Entropy in a Few-Electron Nanodevice. Preprints 2021, 2021040609 (doi: 10.20944/preprints202104.0609.v1). Pyurbeeva, E.; Mol, J. A Thermodynamic Approach to Measuring Entropy in a Few-Electron Nanodevice. Preprints 2021, 2021040609 (doi: 10.20944/preprints202104.0609.v1).

Abstract

The entropy of a system gives a powerful insight into its microscopic degrees of freedom, however standard experimental ways of measuring entropy through heat capacity are hard to apply to nanoscale systems, as they require the measurement of increasingly small amounts of heat. Two alternative entropy measurement methods have been recently proposed for nanodevices: through charge balance measurements and transport properties. We describe a self-consistent thermodynamic framework for treating few-electron nanodevices which incorporates both existing entropy measurement methods, whilst highlighting several ongoing misconceptions. We show that both methods can be described as special cases of a more general relation and prove its applicability in systems with complex microscopic dynamics – those with many excited states of various degeneracies.

Subject Areas

nanoscale system; quantum transport; Coulomb blockade; entropy measurement; thermodynamic relations

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