Emmanuel Díaz retweetledi

There is a type of quasiparticle, called a semi-Dirac fermion, that exists in a bizarre state where it has mass when moving in one direction but is massless when moving in a perpendicular direction.
First predicted 16 years ago, physicists finally observed this behaviour in 2024 within a crystal of zirconium silicon sulfide (ZrSiS).

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