Researchers from France, the Netherlands and Spain have developed a new scanning tunneling microscope technique to study the topological electronic properties of materials and have imaged a topological singularity near a hydrogen atom grafted on a graphene surface. The work, published in Nature, shows how the techniques could be applied to other materials in the search for new topological electronic states.
The French members of the team are from the Université Grenoble Alpes, the University of Bordeaux, the CEA and the CNRS. They are led by Vincent Renard.
Read the research paper: Measuring the Berry phase of graphene from wavefront dislocations in Friedel oscillations. Vincent Renard et al. Nature 10.1038/s41586-019-1613-5