Resonant phonons : localization in a structurally ordered crystal
Beardo Ricol, Albert (University of Colorado Boulder. Department of Physics)
Desmarchelier, Paul (Université de Lyon. Institut National des Sciences Apliquées)
Tsai, Chia-Nien (University of Colorado Boulder. Smead Department of Aerospace Engineering Sciences)
Rawte, Prajit (University of Colorado Boulder. Smead Department of Aerospace Engineering Sciences)
Termentzidis, Konstantinos (Université de Lyon. Institut National des Sciences Apliquées)
Hussein, Mahmoud I. (University of Colorado Boulder. Department of Physics)

Fecha:	2024
Descripción:	16 pàg.
Resumen:	Phonon localization is a phenomenon that influences numerous material properties in condensed matter physics. Anderson localization brings rise to localized atomic-scale phonon interferences in disordered lattices with an influence limited to high-frequency phonons having wavelengths comparable to the size of a randomly perturbed unit cell. Here we computationally expose a form of phonon localization induced by augmenting a crystalline material with intrinsic phonon nanoresonators with feature sizes that can be smaller or larger than the phonon wavelengths but must be relatively small compared to the phonon mean free paths. This mechanism is deterministic and takes place within numerous discrete narrow-frequency bands spread throughout the full spectrum with central frequencies controlled by design. For demonstration, we run molecular dynamics simulations of all-silicon nanopillared membranes at room temperature and apply to the underlying thermalized environment narrowband wave packets as an excitation at precisely the frequencies where resonant hybridizations are evident in the anharmonic phonon band structure. Upon comparison to other frequency ranges where the nanostructure does not exhibit local resonances, significant intrinsic spatial phonon localization along the direction of transport is explicitly observed. Furthermore, the energy exchange with external sources is minimized at the resonant frequencies. We conclude by making a direct comparison with Anderson localization highlighting the superiority of the resonant phonons across both sides of the interference frequency limit.
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Lattice dynamics ; Localization ; Phonons ; Transport phenomena
Publicado en:	Physical review B, Vol. 110, issue 19 (November 2024) , art. 195438, ISSN 2469-9969

DOI: 10.1103/PhysRevB.110.195438

16 p, 5.4 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Grup de Propietats de Transport a la Nanoescala
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