Physics

A particle like slow light

Weyl particles are not particles which can move on their own (like electrons or protons), they only exist as 'quasiparticles' within a solid material. Now, for the first time, such Weyl particles has been found in a special kind of material, which is particularly interesting for novel technological applications: scientists have measured Weyl-fermions in a material with highly correlated electrons. Surprisingly, these fermions move very slowly, despite having no mass.