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  Violation of Boltzmann Equipartition Theorem in Angular Phonon Phase Space Slows down Nanoscale Heat Transfer in Ultrathin Heterofilms

Hanisch-Blicharski, A., Tinnemann, V., Wall, S., Thiemann, F., Groven, T., Fortmann, J., et al. (2021). Violation of Boltzmann Equipartition Theorem in Angular Phonon Phase Space Slows down Nanoscale Heat Transfer in Ultrathin Heterofilms. Nano Letters, 21(17), 7145-7151. doi:10.1021/acs.nanolett.1c01665.

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Supporting Information: Finite element simulations on transient heating of Si substrate; additional atomic force micrographs; calculations on transmission probability for ballistic phonon transport
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 Creators:
Hanisch-Blicharski, A.1, Author
Tinnemann, V.1, Author
Wall, S.1, Author
Thiemann, F.1, Author
Groven, T.1, Author
Fortmann, J.1, Author
Tajik, M.1, Author
Brand, C.1, Author
Frost, B.-O.1, Author
von Hoegen, A.2, Author              
Horn-von Hoegen, M.1, 3, Author
Affiliations:
1Faculty of Physics, University of Duisburg-Essen, ou_persistent22              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Center for Nanointegration (CENIDE), ou_persistent22              

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Free keywords: Nanoscale heat transport, acoustic mismatch model, diffusive mismatch model, thermal boundary conductance, ultrathin Bi films, TR-RHEED
 Abstract: Heat transfer through heterointerfaces is intrinsically hampered by a thermal boundary resistance originating from the discontinuity of the elastic properties. Here, we show that with shrinking dimensions the heat flow from an ultrathin epitaxial film through atomically flat interfaces into a single crystalline substrate is significantly reduced due to violation of Boltzmann equipartition theorem in the angular phonon phase space. For films thinner than the phonons mean free path, we find phonons trapped in the film by total internal reflection, thus suppressing heat transfer. Repopulation of those phonon states, which can escape the film through the interface by transmission and refraction, becomes the bottleneck for cooling. The resulting nonequipartition in the angular phonon phase space slows down the cooling by more than a factor of 2 compared to films governed by phonons diffuse scattering. These allow tailoring of the thermal interface conductance via manipulation of the interface.

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Language(s): eng - English
 Dates: 2021-08-112021-05-032021-08-182021-09-08
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.nanolett.1c01665
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 21 (17) Sequence Number: - Start / End Page: 7145 - 7151 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403