Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Ultrafast Electron Dynamics at Surfaces and Interfaces 1
O 2.1: Vortrag
Montag, 5. September 2022, 10:30–10:45, H3
Floquet Dressing and Multiphoton Photoemission on Metal Surfaces — •Yun Yen1,2 and Michael Schüler2 — 1Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland — 2Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Floquet engineering allows us to realize the control of quantum materials and explore exotic properties from light-matter interaction. Along with the development of various ultrafast experimental techniques, non-equilibrium quantum systems have gained more interests.
Metal surfaces such as Cu(111) or Ag(111) are considered as benchmarks for photoemission spectroscopy with nonlinear optical responses. The interplay between Shockley surface states (SS), image potential states (IP), and the related dressed bands can be studied with ultrafast pump-probe pulses. Starting from model potential, we utilize real space time-dependent surface flux method and non-equilibrium Green*s function to simulate the non-equilibrium dynamics on the metal surfaces. We calculate the interferometric-time-resolved multiphoton photoemission (ITR-mPP) spectrum. The Fourier analysis of the simulated ITR-mpp spectrum shows the optical dressing of the surface electronic structures. Our approach successfully reproduce the previous experimental data, which allows us to investigate the origins of these signatures.