Zigzag (IMAGE) Technische Universität Dresden Caption Illustration of a graphene nanoribbon with zigzag edges and the precursor molecules used in its manufacture. Electrons on the two zigzag edges display opposite directions of rotation (spin) -- "spin-up" on the bottom edge (red) or "spin-down" on the top edge (blue). Credit EMPA 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.