Oddball ‘neutral electron’ possibly discovered in new state of matter

A previously unknown quantum particle — equivalent to a neutral electron — may have been found in a new state of matter.

The chargeless oddball wouldn’t be one of the fundamental building blocks of matter, however. Rather, it would be a quasiparticle that emerges from the collective behavior of a material only when conditions are right. In the new study, those conditions were observed in sheets of a semi-metallic crystal that exhibited some strange electro-magnetic behavior. 

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