Low-Temperature Coherent Thermal Conduction in Thin Phononic Crystal Membranes
Puurtinen, T., & Maasilta, I. (2016). Low-Temperature Coherent Thermal Conduction in Thin Phononic Crystal Membranes. Crystals, 6(6), Article 72. https://doi.org/10.3390/cryst6060072
Julkaistu sarjassa
CrystalsPäivämäärä
2016Tekijänoikeudet
© the Authors, 2016. This is an open access article distributed under the terms of a Creative Commons License.
In recent years, the idea of controlling phonon thermal transport coherently using
phononic crystals has been introduced. Here, we extend our previous numerical studies of ballistic
low-temperature heat transport in two-dimensional hole-array phononic crystals, and concentrate
on the effect of the lattice periodicity. We find that thermal conductance can be either enhanced or
reduced by large factors, depending on the the lattice period. Analysis shows that both the density of
states and the average group velocity are strongly affected by the periodic structuring. The largest
effect for the reduction seen for larger period structures comes from the strong reduction of the group
velocities, but a contribution also comes from the reduction of the density of states. For the short
period structures, the enhancement is due to the enhanced density of states.
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https://converis.jyu.fi/converis/portal/detail/Publication/26163712
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