Sentences with phrase «phonon heat»

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

We show further that phonon heat conduction localization happens in GaAs / AlAs superlattice by placing ErAs nanodots at interfaces.

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.

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

This governs how vibrations such as waves of heat and sound, known as phonons, pass through materials.

Phonons thus can't carry heat across a porous material as efficiently, giving the material a low thermal conductivity, which turns out to increase the efficiency of heat - to - electricity conversion.

Heat travels through a material via phonons, quantized units of vibration that act as heat - carrying particHeat travels through a material via phonons, quantized units of vibration that act as heat - carrying particheat - carrying particles.

And in the same way that white light is actually composed of many different colors of light, these thermal phonons are made up of many different frequencies — each carrying varying amounts of heat.

Until now, heat transport in nanostructured materials has largely been controlled by introduction of atomic - scale impurities, interfaces, surfaces and nanoparticles that reduce heat flow by scattering the phonons diffusely.

Their research has also introduced a new dimension to the emerging field of «phononics» which is the controlling and manipulating of heat flow with phonons (particles which transmit heat within solid materials).

Henry's successes in capturing the atomic vibrations of glass was due to the development of a new way of studying the dynamics of phonons, which he'd created with with Wei Lv, a doctoral student in his lab, Known as Green - Kubo Modal Analysis (GKMA), the new method uses molecular dynamics simulations to more accurately calculate the contributions different modes of vibration make to the heat conduction.

The energy in the phonons is measured as heat in the superconducting detectors, and the charge signal is measured by the charge detectors.

The transport of heat in amorphous silicon is determined by the behavior of phonons in the material.

The ORNL researchers observed atomic vibrations that underpin heat flow — called phonons — and tried to understand their origins in terms of electronic structure and chemistry.

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

Each dot absorbs and concentrates a laser's heat, which then flows through the underlying material as phonons.

Creating nanoscale heat sources was a significant challenge: Lasers can only be focused to a spot the size of the light's wavelength, about one micron — more than 10 times the length of the mean free path in some phonons.

By varying the size of heat sources, Chen and his colleagues can map out how far phonons travel between collisions, and how much they contribute to heat conduction.

A phonon's mean free path is the distance a phonon can carry heat before colliding with another particle; the longer a phonon's mean free path, the better it is able to carry, or conduct, heat.

For example, if an engineer desires a material with certain thermal properties, the mean free path distribution could serve as a blueprint to design specific «scattering centers» within the material — locations that prompt phonon collisions, in turn scattering heat propagation, leading to reduced heat carrying ability.

When they modeled heat flow between two sodium chloride lattices, the researchers found that heat flowed from one lattice to the other via phonon tunneling, at gaps of one nanometer and smaller.

However, the new research shows that phonons can reach across a gap as small as a nanometer, «tunneling» from one material to another to enhance heat transport.

Normally these waves, or phonons, are only able to carry heat within, and not between, materials.

While atomic vibrations, or phonons, typically can not transport heat across distances larger than a few atoms, the team found that the atoms» summed electromagnetic force can create a «bridge» for phonons to cross.

«Phonon tunneling» explains heat flow across nanometer - wide gaps.»

The study also reveals a dramatic reduction of the number of phonons carrying heat, as a result of structural complexity, allowing a simple and general...

Resume: Progress in the last few decades in nano - scale thermal transport has enabled a significant degree of control over heat and sound propagation by lattice vibrations - phonons.

Progress in the last few decades in nano - scale thermal transport has enabled a significant degree of control over heat and sound propagation by lattice vibrations - phonons.

Accessing the coherent heat conduction regime opens a new venue for phonon engineering.

In solids, sounds and heat are entangled in the form of a quasiparticle called a phonon.

Dresselhaus receives the prize for her research into uniform oscillations of elastic arrangements of atoms or molecules called phonons, phonon - electron interactions and heat conductivity in nanostructures.

Someone who thinks that heat is transferred by phonons, and that phonons have a characteristic momentum (mass and velocity).