Subcycle Band-Structure Videography of IR-driven Graphene

作者：Vincent Eggers, Giacomo Inzani, Manuel Meierhofer, Lasse Münster, Jakob Helml, R. Wallauer, Sarah Zajusch, Suguru Ito, Leon Machtl, Hao Yin, Christian Kumpf, François C. Bocquet, Changhua Bao, J. Güdde, F. Stefan Tautz, Rupert Huber, U. Höfer · 年份：2025 · DOI：10.1109/irmmw-thz61557.2025.11319785 · 研究领域：Laser-Matter Interactions and Applications、Spectroscopy and Quantum Chemical Studies、Laser Material Processing Techniques

We demonstrate, for the first time, subcycle band-structure videography, directly accessing IR-driven carrier dynamics over the entire momentum space with few-femtosecond temporal resolution. By combining photoemission momentum microscopy with strong, phase-stable, few-cycle mid-infrared and sub-10-fs extreme-ultraviolet pulses, we study lightwave-driven currents in graphene and their timing with the pump field. Twist angle-dependent scattering times are determined for monolayers with different rotation angles relative to the SiC substrate. The 2D electron distribution reveals the role of carriers and phonons in scattering dynamics, highlighting limits to fully coherent light-matter interaction.