Results 261 to 270 of about 129,819 (311)
Some of the next articles are maybe not open access.
Nature Materials, 2023
Colloidal nanocrystals are successfully used as nanoscale building blocks for creating hierarchical solids with structures that range from amorphous networks to sophisticated periodic superlattices. Recently, it has been observed that these superlattices exhibit collective vibrations, which stem from the correlated motion of the nanocrystals, with ...
Maximilian Jansen +2 more
openaire +3 more sources
Colloidal nanocrystals are successfully used as nanoscale building blocks for creating hierarchical solids with structures that range from amorphous networks to sophisticated periodic superlattices. Recently, it has been observed that these superlattices exhibit collective vibrations, which stem from the correlated motion of the nanocrystals, with ...
Maximilian Jansen +2 more
openaire +3 more sources
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, Zhou Yanguang, Bing-Yang Cao
exaly +3 more sources
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, Zhou Yanguang, Bing-Yang Cao
exaly +3 more sources
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 ...
openaire +2 more sources
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.
openaire +1 more source
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.
openaire +1 more source
Nature Nanotechnology, 2022
A clever phononic crystal design produces a wide band gap for hypersonic phonons.
openaire +2 more sources
A clever phononic crystal design produces a wide band gap for hypersonic phonons.
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
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
openaire +1 more source
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
openaire +2 more sources