Search results for phonons

Condensed Matter Jul 27, 2023

Some alloys don't change size when heated, and we now know why

Nearly every material, whether it is solid, liquid, or gas, expands when its temperature goes up and contracts when its temperature goes down. This property, called thermal expansion, makes a hot air balloon float, and the ...

Condensed Matter Jul 24, 2023

'Quantum avalanche' explains how nonconductors turn into conductors

Looking only at their subatomic particles, most materials can be placed into one of two categories.

Condensed Matter Jul 21, 2023

Calculating thermal properties from phonon behaviors

A new study determines the thermal properties of advanced solid materials, based on first-principles calculations of quantum vibrations.

Condensed Matter Jul 20, 2023

Discovery may lead to terahertz technology for quantum sensing

Visible light is a mere fraction of the electromagnetic spectrum, and the manipulation of light waves at frequencies beyond human vision has enabled such technologies as cell phones and CT scans.

Condensed Matter Jul 20, 2023

New record set for highest elemental superconducting transition temperature

A research team led by Prof. Chen Xianhui from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), collaborating with the team led by Prof. Sun Jian from Nanjing University, ...

Nanomaterials Jul 19, 2023

Chemically bonded multi-nanolayer aerogel for thermal superinsulation

Thermal superinsulation materials with low thermal conductivities are essential for thermal insulation and protection under extreme conditions. These materials are particularly required in fields including deep-space exploration, ...

Soft Matter Jul 19, 2023

Dynamics of molecular rotors in bulk superfluid helium

Molecules immersed in liquid helium can probe superfluidity since their electronic, vibrational and rotational dynamics can provide valuable cues about the superfluid at the nanoscale. In a new report in Science Advances, ...

Optics & Photonics Jul 17, 2023

Laser squared: A two-domain photon-phonon laser

Lasers are a significant historical invention with ubiquitous impact in society. The concept also has interdisciplinary applications as phonon lasers and atom lasers. A laser in one physical domain can be pumped by energy ...

Nanophysics Jul 14, 2023

New study reveals spin in quantum dots' carrier multiplication

A new approach to developing semiconductor materials at tiny scales could help boost applications that rely on converting light to energy. A Los Alamos-led research team incorporated magnetic dopants into specially engineered ...

Condensed Matter Jul 14, 2023

Thanks to trapped electrons, a material expected to be a conducting metal remains an insulator

New research sheds light on the mechanism behind how a special material changes from an electrically conducting metal to an electric insulator. The researchers studied lanthanum strontium nickel oxide (La1.67Sr0.33NiO4) derived ...

page 11 from 40