Entropic signature of resonant thermal transport : ordered form of heat conduction
Beardo Ricol, Albert (University of Colorado Boulder. Department of Physics)
Rawte, Prajit (University of Colorado Boulder. Smead Department of Aerospace Engineering Sciences)
Tsai, Chia-Nien (University of Colorado Boulder. Smead Department of Aerospace Engineering Sciences)
Hussein, Mahmoud I. (University of Colorado Boulder. Department of Physics)

Data:	2025
Resum:	Thermal transport in crystals is influenced by chemistry, boundaries, and nanostructure. The anharmonic phonon band structure extracted from molecular dynamics simulations provides an illuminating view of both the type and extent of prevalence of wavelike mechanisms underlying the transport, yet falls short of elucidating the nature of thermal evolution for different phonon regimes. Here, we present an analysis framework for the characterization of the entropic signature of the mechanisms induced by boundaries and nanostructure, using both equilibrium and non-equilibrium atomistic simulations. Specifically, we examine the effects of phonon confinement, Bragg scattering, and local resonances on the configurational phase space in room-temperature nanostructured silicon, and quantify how each modifies the rate of entropy production and thermal relaxation. We reveal that the presence of phonon local resonances densely spanning the full spectrum enables a highly ordered regime of heat conduction to be approached, where irreversible evolution and entropy maximization are severely hindered by extensive mode hybridizations caused by the resonances. This unique regime of transport paves the way for ultra-precise phonon control for a wide range of applications in condensed matter physics.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Phonons ; Nanostructures ; Nanophononic metamaterials ; Local resonances ; Entropy production ; Thermal transport
Publicat a:	Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 481, Issue 2310 (March 2025) , art. 20240538, ISSN 1471-2946

DOI: 10.1098/rspa.2024.0538

22 p, 2.4 MB

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