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Articles by R. Wallauer
Subcycle videography of Landau–Zener–Majorana transitions in graphene
Abstract Strong light fields have unlocked entirely new possibilities to tailor coherent electron trajectories, engineer band structures and shape emergent phases of matter all-optically1,2,3,4,5,6,7,8,9. Unravelling the underlying quantum mechanisms requires a visualization of the lightwave-driven electron motion10,11 directly in the band structure.
Tracing orbital images on ultrafast time scales
Electron dynamics in time and space Following molecular excitation and electron transfer processes in time and space within a single experiment is a long-standing goal of spectroscopy in the field of chemistry. Wallauer et al. combined tomographic photoemission imaging with a femtosecond pump-probe scheme to trace the excited state molecular orbitals of surface-adsorbed molecules with both spatial and temporal resolution.
Tracing orbital images on ultrafast time scales
Abstract Frontier orbitals determine fundamental molecular properties such as chemical reactivities. Although electron distributions of occupied orbitals can be imaged in momentum space by photoemission tomography, it has so far been impossible to follow the momentum-space dynamics of a molecular orbital in time, for example through an excitation or a chemical reaction.
Tracing orbital images on ultrafast time scales
R. Wallauer https://orcid.org/0000-0002-0359-0814, M. Raths https://orcid.org/0000-0002-1965-6064, K. Stallberg https://orcid.org/0000-0002-7253-156X, L. Münster https://orcid.org/0000-0003-1933-4767, D. Brandstetter https://orcid.org/0000-0002-0434-1289, X. Yang https://orcid.org/0000-0002-7632-0401, J. Güdde https://orcid.org/0000-0002-0243-7877, … Show All … , P. Puschnig https://orcid.org/0000-0002-8057-7795, S. Soubatch https://orcid.org/0000-0002-1455-0260, C.
Momentum-resolved observation of ultrafast interlayer charge transfer between the topmost layers of $\mathrm{Mo}{\mathrm{S}}_{2}$
Abstract We report on the direct observation of electron transfer between the surface and the second layer of the prototypical transition-metal dichalcogenide 2H−MoS2. We are able to disentangle the excitation and the transfer process in our measurement. Thereby, we determine both the momentum location and the duration of the electron transfer between the first two layers.
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