Results 271 to 280 of about 108,889 (317)
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The Journal of the Acoustical Society of America, 1969
Upon increase in frequency of ultrasonic waves in solids—i.e., for an increase in energy of coherent phonons and increase in ultrasonic intensity—the interaction of phonons and phonons, electrons, photons, and magnons becomes more and more important. Interactions between coherent phonons are discussed.
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Upon increase in frequency of ultrasonic waves in solids—i.e., for an increase in energy of coherent phonons and increase in ultrasonic intensity—the interaction of phonons and phonons, electrons, photons, and magnons becomes more and more important. Interactions between coherent phonons are discussed.
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Effects of pressure on the phonon–phonon and electron–phonon interactions in semiconductors
physica status solidi (b), 2004AbstractWe discuss the dependence of phonon frequencies on hydrostatic pressure for tetrahedrally bonded semiconductors, in particular the linear term represented by mode Grüneisen parameters. The relation between these parameters and the thermal expansion is also elucidated.
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Physical Review B, 1985
Inelastic neutron time-of-flight spectra from polycrystalline cesium were measured at 50, 100, and 290 K for a large variety of momentum transfers $Q$ and energy transfers $\ensuremath{\omega}$. Born-von K\'arm\'an models were fitted to the resulting ($Q, \ensuremath{\omega}$) topography. These models were used to calculate the phonon dispersion curves
Nuecker, N., Buchenau, U.
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Inelastic neutron time-of-flight spectra from polycrystalline cesium were measured at 50, 100, and 290 K for a large variety of momentum transfers $Q$ and energy transfers $\ensuremath{\omega}$. Born-von K\'arm\'an models were fitted to the resulting ($Q, \ensuremath{\omega}$) topography. These models were used to calculate the phonon dispersion curves
Nuecker, N., Buchenau, U.
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Phonon-Phonon and Phonon-Defect Scattering in 4He Crystals
1993The thermal conductivity measurements were made in pure 4He and 4He+3He liquid and solid mixtures under pressure up to 84 atm.The data cover the temperature range down to 0,4 K and include the results of investigations of recovery processes in plastically deformed crystals.The importance of different phonon relaxation mechanisms is estimated from the ...
L. P. Mezhov-Deglin, A. A. Levchenko
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Nature Nanotechnology, 2022
A clever phononic crystal design produces a wide band gap for hypersonic phonons.
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A clever phononic crystal design produces a wide band gap for hypersonic phonons.
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Phonon Optics and Phonon Propagation in Semiconductors
Science, 1981Recent experiments involving the propagation of extremely high frequency, short-wavelength acoustic phonons in semiconductors are described. Such phonons, which play an important role in thermal energy transport and nonradiative recombination processes, can be used as sensitive microscopic probes of electronic, defect, and interface states. Experiments
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PHONON-PHONON INTERACTION IN CRYSTALS
1963Abstract : The generation, propagation and interaction of phonons with emphasis on the phonon interaction in crystals were investigated. Several phonon phonon interaction processes in X-cut quartz, silicon and germanium were investigated. These involve forward traveling wave, backward traveling wave, frequency up conversion and harmonic generation ...
Stephen Wanuga, Walter Brouillette
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1993
Abstract In this section, we discuss the interaction between the conduction electrons and the crystal lattice in a metal. At first glance it may seem that it should be possible to treat this interaction in a manner analogous to that used in the theory of radiation, where the full Hamiltonian contains free electron and photon fields, plus
Vladimir Z Kresin +2 more
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Abstract In this section, we discuss the interaction between the conduction electrons and the crystal lattice in a metal. At first glance it may seem that it should be possible to treat this interaction in a manner analogous to that used in the theory of radiation, where the full Hamiltonian contains free electron and photon fields, plus
Vladimir Z Kresin +2 more
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Phonon-phonon interactions in silicon
Czechoslovak Journal of Physics, 1996At low temperatures the acoustic properties of glasses differ from those of crystals. The anomalies can be explained by the existence of localized low-energy excitations with a broad distribution of energy and relaxation times. The dynamics of the excitations, also described as tunneling states (TS) is, on a phenomenological level, well understood for ...
C. Laermans, M. Coeck
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Phonons in III–V nitrides: Confined phonons and interface phonons
Physica E: Low-dimensional Systems and Nanostructures, 2001Abstract Phonons in III–V nitrides are examined experimentally for dimensionally confined systems and for alloys of InGaN with a view towards understanding the phonon modes of these systems. Results are compared with the predictions of Loudon's model for uniaxial semiconductors.
M Dutta +7 more
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