Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 16: Poster Monday: Ultrafast Processes 1

O 16.7: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Time-resolved ARPES probing Rabi Oscillations and Landau-Zener-Stückelberg Interferences in Graphene - a Proposal — •Eduard Moos, Hauke Beyer, and Michael Bauer — Institute of Experimental and Applied Physics, Kiel University, Germany

At sufficiently high intensities, the interaction of few-cycle laser fields with solids gives rise to strong-field effects envisioning novel and exciting strategies for controlling optical and electronic properties via the electric field waveform on sub-femtosecond timescales. A striking example is the CEP-control of light-field-driven currents in graphene due to Landau-Zener-Stückelberg (LZS) interferences [1] resulting from the complex interplay of field-driven adiabatic intraband and diabatic interband transitions. Simulations show that the LZS-interferences give rise to characteristic asymmetries in the momentum-distribution of the residual conduction band population in the Dirac cone on top of a symmetric quasi-periodic pattern indicative for Rabi oscillations. TRARPES using few cycle femtosecond pump laser pulses seems to be in ideal tool for the investigation of these processes and there dependence on parameters such as pulse peak electric field strength E0, laser polarization, and CEP phase. Based on preliminary results on graphite using 7 fs few-cycle NIR pump-pulses we will discuss in this presentation the prospects, but also the challenges that arise in such type of TRARPES experiment.

[1] T. Higuchi, et al., Nature 550, 224 (2017)

[2] G. Rohde, et al., Phys. Rev. Lett. 121, 256401 (2018)