Phonon dispersions of silicon and germanium from first …
Jul 15, 1994 · Phonon dispersions of Si and Ge calculated are in excellent agreement with experiments. We present the calculation of the full phonon spectrum for silicon and germanium with the pseudopotential method and the local-density approximation without using linear-response theory.
Investigation of phonon coherence and backscattering using silicon ...
Jan 4, 2017 · We conclude phonon coherence is unimportant for thermal transport in silicon nanomeshes with periodicities of 100 nm and higher and temperatures above 14 K, and phonon backscattering, as...
Calculated phonon dispersion relation for bulk silicon compared …
We present theoretical calculations of phonon dispersion in silicon nanocrystals using an approach based on the adiabatic bond charge model. To deal with the boundary conditions, …
For many technological applications involving bulk silicon (T > 100 K), phonon–phonon scattering is the dominant mechanism governing thermal conductivity.As the char-acteristic device length decreases, thermal conductivity decreases because boundary scattering increases and limits the MFPs.The intermediate regime where both phonon– phonon ...
In this work, we focus on a direct computation of anharm for crystalline silicon. We compute the phonon amplitudes from the atomic displacements and velocities obtained from a molecular dynamics simulation.
Electron–phonon interactions in silicon: Mean free paths, related ...
May 1, 2015 · The mean free path (MFP) for electron–phonon interactions in pure silicon is an important characteristic needed both for low energy electron transport calculations using Boltzmann transport equation, and for Monte Carlo simulations. Full band calculations present a basic (though complicated) approach to the solution of the problem.
Jan 21, 2015 · The lattice dynamics of silicon has attracted ongoing attention owing to its anomalous thermal expansion, which changes from negative to positive at low temperatures. Phonon dispersions of silicon have been reported, as have phonon densities of states (DOS), thermal properties and mode Gr ̈uneisen parameters12–17.
Direct observation of large electron–phonon interaction
Nov 27, 2020 · By optically exciting electron-hole pairs in a crystalline silicon membrane, we single out the effect of the phonon–carrier interaction. The enhanced phonon scattering by photoexcited free...
Spectral analysis of coherent and incoherent phonon transport in ...
Aug 2, 2024 · In this paper, we investigate the spectral thermal transport properties of silicon nanomeshes (SNMs) with large and small holes arranged periodically, aperiodically in the direction (ap-x), and fully aperiodically (ap-xy).
Regulating phonon transport in silicon nanofilms by resonant ...
Mar 1, 2024 · In this investigation, we delve into the realm of phonon resonance within silicon nanofilms (SiNFs) outfitted with resonant pillars, by employing classical molecular dynamics simulations. Our study reveals that SiNFs featuring resonant pillars exhibit a variable reduction in thermal conductivity contingent upon the thickness of the SiNFs.