Non-perturbative Floquet-Landau-Zener mechanism in multiphoton photoemission on metal surface

Yun Yen; Marcel Reutzel; Andi Li; Hrvoje Petek; Michael Schüler

doi:10.1117/12.3023120

11 June 2024 Non-perturbative Floquet-Landau-Zener mechanism in multiphoton photoemission on metal surface

Yun Yen, Marcel Reutzel, Andi Li, Hrvoje Petek, Michael Schüler

Proceedings Volume PC12992, Advances in Ultrafast Condensed Phase Physics IV; PC129920W (2024) https://doi.org/10.1117/12.3023120
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

In the Floquet engineering picture, time periodic optical fields perturbatively replicate states shifted by photon energy quanta, and cause field-dependent Autler-Townes splitting. As the field intensifies, light matter interaction shows more non-perturbative nature. Here we reveal the onset of non-perturbative responses in multiphoton photoemission (mPP) process for a driven two-level system of Cu(111) surface states. With strong enough driving, Floquet side bands form avoided crossing gaps, and thus lead to Landau-Zener (LZ) non-adiabatic tunneling within subcycle time scale. We further simulate the population dynamics with Instantaneous Floquet State (IFS) formalism, and successfully reproduce experimental mPP features. Interpretation of the mPP process by Floquet-LZ theory elaborates the importance of non-adiabatic dynamics in strong field regime.

Conference Presentation

Citation Download Citation

Yun Yen, Marcel Reutzel, Andi Li, Hrvoje Petek, and Michael Schüler "Non-perturbative Floquet-Landau-Zener mechanism in multiphoton photoemission on metal surface", Proc. SPIE PC12992, Advances in Ultrafast Condensed Phase Physics IV, PC129920W (11 June 2024); https://doi.org/10.1117/12.3023120

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