Physics General News

Halting a wave in its tracks

 Physics General News
 23 May 2022
Topological ideas have recently taken the center stage of modern electromagnetics. Typical topological photonic systems are based on nonreciprocal materials, a class of materials that enables asymmetric light–matter interactions. In particular, nonreciprocal platforms may support unidirectional...

Diamond mirrors for high-powered lasers

 Physics General News
 23 May 2022
Just about every car, train and plane that's been built since 1970 has been manufactured using high-power lasers that shoot a continuous beam of light. These lasers are strong enough to cut steel, precise enough to perform surgery, and powerful enough to carry messages into deep space. They are so...

Mixing laser beams and X-ray beams

 Physics General News
 20 May 2022
Unlike fictional laser swords, real laser beams do not interact with each other when they cross—unless the beams meet within a suitable material allowing for nonlinear light-matter interaction. In such a case, wave mixing can give rise to beams with changed colors and directions....

Researchers find imperfections provide protection for system symmetry

 Physics General News
 20 May 2022
An international research collaboration has discovered how to exploit certain defects to protect confined energy in acoustics systems. Their experimental approach provides a versatile platform to create at-will defects for further theoretical validation and to improve control of waves in other...

Flow of liquid metals found to exhibit surprising turbulence

 Physics General News
 20 May 2022
Some metals are in liquid form, the prime example being mercury. But there are also enormous quantities of liquid metal in the Earth's core, where temperatures are so high that part of the iron is molten and undergoes complex flows. A team at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) has now...

Spin keeps electrons in line in iron-based superconductor

 Physics General News
 19 May 2022
Researchers from PSI's Spectroscopy of Quantum Materials group together with scientists from Beijing Normal University have solved a puzzle at the forefront of research into iron-based superconductors: the origin of FeSe's electronic nematicity. Using Resonant inelastic X-ray scattering (RIXS) at...

How to explain localized gap modes in Bose-Einstein condensates

 Physics General News
 19 May 2022
Bose-Einstein condensates (BECs), created in ultracold bosonic atoms and degenerate quantum gases, are a macroscopic quantum phenomenon and are considered as a single particle in mean-filed theory. By preparing the BECs or ultracold atomic gases onto optical lattices, the existence of nonlinear...

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