New fermions are traditionally discovered in accelerators like Fermilab’s Tevatron, where signs of novel particles are sought in the subnuclear debris generated by highly energetic collisions. In recent years, however, investigations in condensed-matter systems have revealed fermion-like quasiparticles made up of collective excitations of electrons. These quasiparticles are absent in isolation yet are describable by the same equations as fundamental particles. Now, researchers have identified two more quasiparticles by studying the electronic structure of a crystal of cobalt silicide (CoSi).
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