Pines' Demon: Physicists confirm 1956 prediction of massless, neutral composite particle
https://www.sciencedaily.com/releases/2023/08/230818004752.htm
Discussion: https://www.sciencedaily.com/releases/2023/08/230818004752.htm
Pines’ demon observed as 3D acoustic plasmon in Sr2RuO4
https://www.nature.com/articles/s41586-023-06318-8
Pines' demon: https://en.wikipedia.org/wiki/Pines%27_demon
* condensed matter physics
* quant. mech. excited states
* collective excitation of e- in different/out of phase energy bands
* collective excitations: magnon, phason, exciton
In 1956, theoretical physicists predicted that electrons in a solid can do something strange. While they normally have a mass and an electric charge, Pines asserted that they can combine to form a composite particle that is massless, neutral, and does not interact with light. He called this particle a 'demon.' Since then, it has been speculated to play an important role in the behaviors of a wide variety of metals. Unfortunately, the same properties that make it interesting have allowed it to elude detection since its prediction.
I have experience in a condensed matter physics laboratory but I am unable to talk about it because a straightforward account of my work there sounds like the ravings of a mad man
the news about #PinesDemon is not helping
> Since Pines' Demon is predicted to play an important role in a wide range of phenomena, such as #transitions in particular kinds of #semimetals and #superconductivity , the work has important implications for material #physics .
> Usually in science, a "demon" is a hypothetical opponent for scientists and philosophers to argue against in a thought experiment, but Pines' Demon is quite different.
It's actually a type of #plasmon – a discrete unit of waves among rippling through a population of electrons . Plasmons have been described as the #quantum analogue of an #acoustic sound in a classical gas.
#Physicists Have Observed a 'Demon' Plasmon in Strontium Ruthenate
https://www.sciencealert.com/physicists-have-observed-a-demon-plasmon-in-strontium-ruthenate
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