Sentences with phrase «on phonons»

Recently physicists led by Per Delsing of the Chalmers University of Technology in Sweden created such a mechanical ear, which could soon tune in on the phonon's minuscule notes.

Although classical size effects on phonon heat conduction are now well - established and understood, manipulating phonon heat conduction via waves is still a dream to be realized due to the broadband and short wavelength nature of phonons.

Resume: Although classical size effects on phonon heat conduction are now well - established and understood, manipulating phonon heat conduction via waves is still a dream to be realized due to the broadband and short wavelength nature of phonons.

Not exact matches

In order for lateral confinement to be produced, the cross section of the structure must be much smaller than the «mean free path» of a phonon, or only a few to hundreds of nanometers depending on the material, Wang said.

«Our results shed light on some of the long - standing puzzles surrounding this material, reveling unusual spin - phonon coupling.»

On a more basic level, no one has ever studied phonons in action, so scientists simply do not know what happens when they travel through a material.

A central challenge of thermal physics — and of interfacial thermal conductance, specifically — is that phonons exist over a wide frequency range, and how phonons interact with interfaces and other phonons depends on their frequencies.

Scientists can accurately predict the thermal conductivity of many crystalline materials using expressions based on the widely - used «phonon gas model.»

When co-author Zhaoming Zhu, Gauthier's postdoctoral research associate, encoded information onto one of these beams, the data could be imprinted on these newly created phonons and retained for 12 billionths of a second, long enough to be transferred back to light again by shining a third laser through the fiber.

But for much larger heat sources acting on the same material, phonons tend to collide with other phonons and scatter more often.

The fact that this structural characteristic is common to all platinum group elements suggests that compounds based on these elements other than osmium are also likely to be associated with strong spin - phonon coupling.

The capability to tune the acoustic phonon dynamics in technologically relevant group IV nanostructures provides a promising prospect to control the propagation of acoustic and thermal phonons with great implications on nanoscale hypersound and thermal transport.

However, the modal phonon transmission coefficients across these geometrically irregular nanostructures and the effect of nanostructure geometry on thermal transport has not been fully understood.

In this paper, by solving the Boltzmann transport equation (BTE) based on first - principles calculations, we performed a comprehensive study of the phonon transport properties of ML GaN, with detailed comparison to bulk GaN, 2D graphene, silicene and ML BN with similar honeycomb structure.

The latest investigations on the thermal properties of silicon, the most common material in electronics, micro - and nano - electro - mechanical systems (MEMS and NEMS) and photonics, have pointed to nanostructuring as a highly efficient approach to acoustic phonon engineering [1 - 3].

Systematic analysis is performed based on the study of the contribution from phonon branches, comparison among the mode level phonon group velocity and lifetime, the detailed process and channels of phonon — phonon scattering, and phonon anharmonicity with potential energy well.

The combination of temperature dependent micro-Raman and femtosecond reflectivity measurements allows for a complete decoupling of the effects of temperature, geometry, and strain on the acoustic phonon dynamics [2, 3].

In this talk, I will show, however, the wave effects on heat conduction can be observed and exploited to manipulate phonon heat conduction.

It is shown that the acoustic phonon lifetimes can be tuned both by strain engineering of the suspended structures and strain modification by temperature variation in addition to a strong dependence on the thickness of the suspended structures [1].