Phonons can scatter through several mechanisms as they travel through the material. These scattering mechanisms are: Umklapp phonon-phonon scattering, phonon-impurity scattering, phonon-electron scattering, and phonon-boundary scattering. Each scattering mechanism can be characterised by a relaxation rate 1/ which is the inverse of the corresponding relaxation time.
All scattering processes can be taken into account using Matthiessen's rule. Then the combined relaxation time can be written as:
The parameters , , , are due to Umklapp scattering, mass-difference impurity scattering, boundary scattering and phonon-electron scattering, respectively.
Phonons can scatter through several mechanisms as they travel through the material. These scattering mechanisms are: Umklapp phonon-phononscattering...
potential scattering or an anharmonic phonon-phonon (or electron-phonon) scattering process, reflecting an electronic state or creating a phonon with a momentum...
processes are scattering from acoustic phonons, impurity scattering, piezoelectric scattering, etc. In acoustic phononscattering, electrons scatter from state...
models of neutron scattering and related effects. The concept of phonons was introduced in 1932 by Soviet physicist Igor Tamm. The name phonon comes from the...
Brillouin scattering involves the scattering of photons by low frequency phonons providing information regarding elastic properties. Optical phonons and molecular...
well below the resonance frequency of the scattering medium (normal dispersion regime), the amount of scattering is inversely proportional to the fourth...
low-frequency phonons of long wavelength will be limited in relaxation length by elastic Rayleigh scattering. This type of light scattering from small particles...
surface phononscattering, which have an energy range of 10−3 eV to 1 eV. In EELS, an electron of known energy is incident upon the crystal, a phonon of some...
In physics, Raman scattering or the Raman effect (/ˈrɑːmən/) is the inelastic scattering of photons by matter, meaning that there is both an exchange of...
contribution is most important in the temperature region where phonon-electron scattering is predominant. This happens for T ≈ 1 5 θ D {\displaystyle T\approx...
graphene reduces a lot its thermal conductivity due to phononscattering effect. Scattering of phonons result from both acoustic mismatch and reduced symmetry...
the atomic number density. Slack phonon conductivity model mainly considering acoustic phononscattering (three-phonon interaction) is given as k p = k...
apparent below). Here, the + corresponds to phonon emission and – for phonon absorption during the scattering event. A note, because q ⊥ u ( r , t ) {\displaystyle...
crossing principle. Phonon polariton spectra have traditionally been studied using Raman spectroscopy. The recent advances in (scattering-type) scanning near-field...
other scattering mechanisms which apply to different carriers that are not considered here (e.g. remote interface phononscattering, Umklapp scattering)....
In electromagnetism, Brillouin scattering (also known as Brillouin light scattering or BLS), named after Léon Brillouin, refers to the interaction of light...
As the wire diameter is reduced, the phonon boundary scattering dominates over phonon–phonon Umklapp scattering, which decreases the thermal conductivity...
the band-gap minimum. Typical mechanisms are Coulomb scattering and the interaction with phonons. Finally, the electrons recombine with holes under emission...
via interactions between the elementary excitations, such as "phonon-phononscattering". Therefore, using quasiparticles / collective excitations, instead...
measurement of such a surface phonon dispersion curve was reported in 1981, leading to a renewed interest in helium atom scattering applications, particularly...
scattered particle. In some simple cases as phononscattering and a parabolic dispersion relation, the scattering angle is random and evenly distributed on...
Lattice scattering is the scattering of ions by interaction with atoms in a lattice. This effect can be qualitatively understood as phonons colliding...
to predict high temperature behaviour coming from ion motion and phononscattering. Hall effect and magnetoresistance The Hall coefficient has a constant...
electron-phononscattering decreases. The resistivity should rapidly plateau when the temperature drops below the Debye temperature of the phonons, below...
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