Ultrafast imaging shows graphene electrons crossing energy gaps with 100% probability

Researchers in Germany used ultrafast lasers and a photoemission momentum microscope to observe Landau-Zener-Majorana transitions in graphene, with tunneling probability reaching 100%. The study, published in Nature, could inform light-driven control of electronic materials.

• Electrons crossed the energy gap with up to 100% probability
• Method combines femtosecond lasers with a photoemission momentum microscope
• Experiments used ultra-pure graphene samples from Forschungszentrum Jülich
• Findings could enable faster light-controlled electronics