Physiker finden „Pines‘ Dämon“. Erster Nachweis eines lange vorhergesagten neutralen, masselosen Elektronenzustands im Metall. #Physik #Metall #Elektron #Plasmon #PinesDemon
https://www.scinexx.de/news/physik/physiker-finden-pines-daemon/

> 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

#PinesDemon

"We observe a prominent high-frequency hydrodynamic bipolar-plasmon resonance and a weaker low-frequency energy-wave resonance of the Dirac fluid in ultraclean graphene. The hydrodynamic bipolar plasmon is characterized by the antiphase oscillation of massless electrons and holes in graphene. The hydrodynamic energy wave is an electron-hole sound mode with both charge carriers oscillating in phase and moving together."
https://www.nature.com/articles/s41586-022-05619-8#:~:text=We%20observe%20a,and%20moving%20together.

#plasmon #resonance #oscillator #wave #graphene

Plasmonic nanostructure-enhanced Raman scattering for detection of SARS-CoV-2 nucleocapsid protein and spike protein variants.
Analytica Chimica Acta Volume 1239, 25 January 2023, 340651
https://doi.org/10.1016/j.aca.2022.340651
#ramaneffect #plasmon #sarscov2 #covid