Subcycle videography of Landau-Zener-Majorana transitions in graphene.

Attosecond-precision subcycle band-structure videography in graphene visualizes non-adiabatic Landau-Zener-Majorana tunnelling across the entire first Brillouin zone, revealing coherent displacement and distortion at the zone edge.

• Why it matters: Photoelectron momentum microscopy averages over many light cycles, and prior subcycle videography has been limited to small momenta, leaving lightwave-driven processes across momentum space insufficiently visualized.
• What they did: The authors use attosecond-precision, subcycle band-structure videography to track strong-field-driven electron motion in graphene and directly image periodic Landau-Zener-Majorana interband tunnelling throughout the first Brillouin zone.
• The result: The interplay of Dirac-like acceleration and periodic tunnelling produces extremely non-thermal electron distributions that disentangle competing scattering processes and assess their impact on coherent electronic control.