Search results for phonons

Condensed Matter Sep 21, 2020

Aberrant electronic and structural alterations in pressure-tuned perovskite

The perovskite NaOsO3 has a complicated but interesting temperature-dependent metal-insulator transition (MIT). A team led by Drs. Raimundas Sereika and Yang Ding from the Center for High Pressure Science and Technology Advanced ...

Optics & Photonics Sep 18, 2020

Anti-resonant hollow-core optical fiber reduces 'noise'

A new hollow optical fiber greatly reduces the "noise" interfering with the signals it transmits compared to the single-mode fibers now widely used, researchers at the University of Rochester report.

Materials Science Sep 16, 2020

Reaching 90% PL quantum yield in 1-D metal halide by pressure-suppressed nonradiative loss

Low-dimensional perovskite-related metal halides have emerged as a new class of light-emitting materials with tunable broadband emission from self-trapped excitons (STEs). Although various types of low-dimensional structures ...

General Physics Sep 16, 2020

Liquid carbon characterized using a free electron laser

From common soot to precious diamonds, carbon is familiar in many guises, but there have been little more than glimpses of carbon in the liquid form. Researchers at the FERMI Free Electron Laser (FEL) source have now not ...

Optics & Photonics Sep 11, 2020

A phonon laser: Coherent vibrations from a self-breathing resonator

Lasing—the emission of a collimated light beam of light with a well-defined wavelength (color) and phase—results from a self-organization process, in which a collection of emission centers synchronizes itself to produce ...

Materials Science Sep 9, 2020

Researchers fabricate high-quality transparent ceramic

Mid-infrared lasers have been widely used in imaging, detection, diagnostics, environmental monitoring, medicine, industry, defense and others. For mid-infrared laser systems, low phonon energy gain materials are key factors.

General Physics Sep 4, 2020

Opto-thermoelectric microswimmers

In a recent report, Xiaolei Peng and a team of scientists in materials science and engineering at the University of Texas, U.S., and the Tsinghua University, China, developed opto-thermoelectric microswimmers bioinspired ...

General Physics Sep 4, 2020

'Floppy' atomic dynamics help turn heat into electricity

Materials scientists at Duke University have uncovered an atomic mechanism that makes certain thermoelectric materials incredibly efficient near high-temperature phase transitions. The information will help fill critical ...

Optics & Photonics Sep 4, 2020

Electric current is manipulated by light in an organic superconductor

A polarized petahertz current is driven by an ultrashort laser in an organic superconductor. This is in contrast to the common sense belief which is justified by Ohm's law, i.e., a net current cannot be induced by an oscillating ...

Superconductivity Aug 31, 2020

New evidence for quantum fluctuations near a quantum critical point in a superconductor

Among all the curious states of matter that can coexist in a quantum material, jostling for preeminence as temperature, electron density and other factors change, some scientists think a particularly weird juxtaposition exists ...

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