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Elusive particle appears in 'semimetal': Weyl fermions detected in tantalum arsenide, physicists say.
A kind of particle first predicted to exist before the discovery of Pluto has been spotted on Earth within a compound of tantalum and arsenic.
The newly discovered particle, known as a Weyl fermion, resembles a massless electron that darts around and through the material in unusual and exciting ways, physicists report online July 16 in Science.
"It's definitely a big deal," says Leon Balents, a condensed matter theorist at the University of California, Santa Barbara.
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