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Attosecond imaging reveals graphene electrons cross energy gap

By Drooid · Oct 29, 2026 · How we work

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Researchers from Regensburg, Marburg and Jülich observed graphene electrons crossing an energy gap with 100% probability.
They combined ultrafast laser pulses with a photoemission momentum microscope to achieve attosecond imaging.
The method expands sub-cycle momentum coverage by over 100-fold compared with earlier techniques.
Researchers recorded Landau-Zener-Majorana transitions, showing electrons move between bands without occupying forbidden states.
Vincent Eggers said observing many electrons at once is essential to capture quantum transitions.

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Researchers from Regensburg, Marburg and Jülich observed graphene electrons crossing an energy gap with 100% probability.
They combined ultrafast laser pulses with a photoemission momentum microscope to achieve attosecond imaging.
The method expands sub-cycle momentum coverage by over 100-fold compared with earlier techniques.
Researchers recorded Landau-Zener-Majorana transitions, showing electrons move between bands without occupying forbidden states.
Vincent Eggers said observing many electrons at once is essential to capture quantum transitions.