CrBiSbTe Sample (IMAGE) DOE/Brookhaven National Laboratory Caption This image has two parts. TOP. This is a typical image of the surface of the CrBiSbTe sample and the location of each Cr magnetic dopant atom is known because each produces a dark triangular 'depression' in the surface. BOTTOM. This is a typical image of the Dirac mass of topological surface electrons in CrBiSbTe. The location of each Cr magnetic dopant atom is marked as a red dot. The Dirac mass evolves from being very low ( blue black) far form dopant atom clusters to very high (yellow) where the magnetic Cr atoms are observed to be dense. Credit Proceedings of the National Academy of Sciences 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.