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O: Fachverband Oberflächenphysik

O 57: Ultrafast Electron Dynamics I

O 57.2: Vortrag

Mittwoch, 19. März 2025, 10:45–11:00, H2

Measuring the non-equilibrium electronic structure of phonon-driven 2D materials — •Niklas Hofmann and Isabella Gierz — University of Regensburg

Quasi-periodic driving of solids with tailored light fields has emerged as a promising pathway for non-equilibrium materials design. To bring this approach to the next level, tailored driving schemes targeting specific degrees of freedom need to be combined with ultrafast probes of the atomic and electronic structure. We combine pump pulses tunable all the way from the Terahertz to the visible spectral range with a time- and angle-resolved photoemission (trARPES) probe to gain access to the transient electronic structure of driven materials. We recently implemented a narrow-band, strong-field Terahertz source [1] that allows for the selective excitation of phonon modes in materials with strong spin-orbit coupling and extreme ultraviolet probe pulses with tunable pulse duration to trace band structure dynamics on sub-cycle as well as cycle-averaged time scales. In this talk we present proof-of-principle experiments on graphene and show the transient electronic structure of WS2 driven at resonance to the E1u phonon mode.

[1] Optics Letters 42, 129 (2017)

Keywords: trARPES; Resonant phonon driving; Terahertz