Illustration of Dispersion on the Surface (IMAGE) Princeton University Caption This is an illustration of the complicated dispersion of the surface fermion arising from a background of mercury and bismuth atoms (blue and red). Credit Mingyee Tsang and Aris Alexandradinata Usage Restrictions Bernevig, et al., Princeton University 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.