Results 161 to 170 of about 396,431 (201)

Phonon-Phonon and Phonon-Defect Scattering in 4He Crystals

1993
The 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 focusing in cubic crystals

Physical Review B, 1985
The nature of the phonon intensity pattern associated with low-temperature heat-pulse propagation is examined theoretically for a wide range of cubic crystals. In general, huge anisotropies in the thermal flux are predicted due to phonon focusing. The phonon-focusing patterns of cubic crystals divide naturally into two major groups, as distinguished by
, Hurley, , Wolfe
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Polarization States in 2D Phononic Crystals and Phononic Crystal Waveguides

2010
We investigate, using the Plane Wave Expansion method and an energy balance criterion, the polarization states of elastic waves in a two dimensional phononic crystal made of vacuum holes in a silicon host matrix. Pure modes can be identified for the out of plane polarization while a continuous variation of the in-plane polarization with the Bloch wave ...
Younes Achaoui, Abdelkrim Khelif, Sarah Benchabane, Vincent Laude   +3 more
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Phonons in Crystals

Nature, 1972
Thermodynamics of Crystals. By Duane C. Wallace. Pp. xviii + 484. (Wiley: London and New York, April 1972.) £8.85.
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Fundamental Properties of Phononic Crystal

2016
Phononic crystals are periodic composite structures where the elastic and acoustic properties display a periodic variation in space. They are in general constituted by a periodic array of inclusions in a matrix. Due to their periodicity, they can exhibit absolute band gaps in which the propagation of elastic waves is prohibited in any direction of the ...
Pennec, Yan, Djafari-Rouhani, Bahram
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Topological Slot in Phononic Crystals

Physical Review Letters
The hallmark of Chern insulators is the unidirectional propagation of chiral edge states, which are immune to imperfections due to bulk topological protection. However, this robustness presents a fundamental challenge in pausing or spatially confining these information carriers on demand.
Qing Wang, Yinfei Zhang, Gangqiao Shao, Han Liu, Weiyin Deng, Hailong He, Liping Ye, Jiuyang Lu, Manzhu Ke, Zhengyou Liu   +9 more
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Phonon–polariton in two-dimensional piezoelectric phononic crystals

Physics Letters A, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yang, Ming-Yi, Wu, Liang-Chieh, Tseng, Jiun-Yi   +2 more
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Tunable Phononic Crystals and Metamaterials

2012
The objective of this chapter is to show how it would be possible to introduce a certain degree of tunability of the properties of phononic crystals. The main concepts underlying the conception of tunable phononic crystals are first introduced with simple models: the one-dimensional harmonic crystal with varying parameter and two coupled one ...
Bou Matar, Olivier, Vasseur, Jerome O., Deymier, P.A.   +2 more
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2D–3D Phononic Crystals

2012
This chapter presents a comprehensive description of the properties of phononic crystals ranging from spectral properties (e.g., band gaps) to wave vector properties (refraction) and phase properties. These properties are characterized by experiments and numerical simulations.
Sukhovich, A., Page, J.H., Vasseur, Jerome O., Robillard, J.F., Swinteck, N., Deymier, P.A.   +5 more
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Phonon Transport in Disordered 2D Phononic Crystals

2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2019
Phonon transport in 2D phononic crystals has attracted attention due to the possibility to control (a) the heat flow, i.e., achieving directional phonon transport, that is of relevance for diode-like behaviour, and (b) controlling the thermal conductivity over orders of magnitude, which is of interest for thermoelectric applications.
Sledzinska, Marianna, Graczykowski, Bartlomiej, Lacroix, David, Alzina, Francesc, Termentzidis, Konstantinos, Melia, Umberto, Sotomayor Torres, Clivia   +6 more
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