Semi-Dirac fermions video (VIDEO) Penn State This video is under embargo. Please login to access this video. Caption Landau levels spectroscopy sheds light on semi-Dirac fermions at the crossing point of two nodal lines within a semi-metal material (Left: Fermi surface of a nodal-line crossing model, Right: Band structure of material). Credit Yinming Shao/Penn State Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.