Weyl Fermion (IMAGE) Princeton University Caption This is a data image (ARPES measurements) showing electron distributions in a Weyl fermion material TaAs. (Left) Surface motion of Weyl electrons are seen in a crescent-shaped Fermi surface (Fermi arc) in the data. (Right) Weyl fermionic electrons disperse like light (inverted "V" shaped, linear) in the bulk of the material. Credit Su-Yang Xu and M. Zahid Hasan, Princeton University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.