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 SM ISO690:2012NIKA, Denis, POKATILOV, Evghenii, ZINCENCO, Nadejda. Acoustic Phonons in a Si/Ge Supracrystal. In: Physics of the Solid State, 2023, vol. 65, pp. 72-75. ISSN 1063-7834. DOI: https://doi.org/10.1134/S1063783424600365 |
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  Physics of the Solid State |
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| Volumul 65 / 2023 / ISSN 1063-7834 | ||||||
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| DOI:https://doi.org/10.1134/S1063783424600365 | ||||||
| Pag. 72-75 | ||||||
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The theoretical investigation of acoustic phonons in Si/Ge three-dimensional quantum dots superlattices (supracrystals) is presented. The acoustic phonon energy spectra are calculated in the framework of the face-centered cubic cell molecular-dynamic model. The dependencies of phonon density of states and phonon group velocity on the phonon energy are studied; the average phonon velocity is found to be close to zero in the wide range of phonon energies meV. The results allow us to predict the extremely low value of the lattice thermal conductivity in supracrystals and correspondingly high value of the thermoelectric figure of merit ZT. |
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