Results 241 to 250 of about 258,084 (292)
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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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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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Resonance in Phonon-Phonon Scattering
Physical Review, 1962The scattering process, two phonons \ensuremath{\rightarrow} two phonons, is examined in perturbation theory. One of the contributions of second order in the cubic anharmonic potential gives rise to an energy denominator that can vanish. This difficulty is removed by noting that the intermediate phonon has a complex self-energy associated with its ...
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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 scattering cross-sections from crossed phonon beams
Solid State Communications, 1982Abstract In two crossed phonon beams generated by heatpulses the attenuation of high frequency phonons by phonon-phonon interaction was observed for the slow transverse phonons of the [1 1 0] branch of Si at 3.6 K. From the experimental data the phonon scattering cross-section for a three phonon normal process can be calculated.
R.A. Huijts, J. van der Elsken
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Terahertz-phonons: New Phonon Spectroscopies
Physica Scripta, 1989In this paper new methods for generation and detection of terahertz-phonons and application of these methods for a study of dynamical properties of high-frequency acoustic phonons in a crystal at low temperature are discussed. Terahertz-phonons are generated via multiphonon absorption by use of pulsed infrared radiation.
K F Renk, U Happek
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International Journal of Heat and Mass Transfer
Recent studies suggest that the phonon-phonon couplings in the near-interface region may affect interfacial thermal transport. In this paper, we revisit the interfacial thermal transport considering phonon-phonon couplings across the interface and in the near-interface region.
Yixin Xu, Bing-Yang Cao, Yanguang Zhou
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Recent studies suggest that the phonon-phonon couplings in the near-interface region may affect interfacial thermal transport. In this paper, we revisit the interfacial thermal transport considering phonon-phonon couplings across the interface and in the near-interface region.
Yixin Xu, Bing-Yang Cao, Yanguang Zhou
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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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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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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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