Birth, rise, and collapse of Floquet-Bloch bands on subcycle time scales

Suguru Ito; Michael Schüler; Manuel Meierhofer; Stefan Schlauderer; Josef Freudenstein; Johannes Reimann; Dmytro Afanasiev; Konstantin A. Kokh; Oleg E. Tereshchenko; Jens Güdde; Michael A. Sentef; Rupert Huber; Ulrich Höfer

doi:10.1117/12.3000356

9 March 2024 Birth, rise, and collapse of Floquet-Bloch bands on subcycle time scales

Suguru Ito, Michael Schüler, Manuel Meierhofer, Stefan Schlauderer, Josef Freudenstein, Johannes Reimann, Dmytro Afanasiev, Konstantin A. Kokh, Oleg E. Tereshchenko, Jens Güdde, Michael A. Sentef, Rupert Huber, Ulrich Höfer

Author Affiliations +

Proceedings Volume PC12884, Ultrafast Phenomena and Nanophotonics XXVIII; PC1288401 (2024) https://doi.org/10.1117/12.3000356
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Floquet–Bloch states are known to form in solids under periodic driving of electrons. We visualize their ultrafast build-up with angle-resolved photoemission spectroscopy and subcycle time resolution. We drive the Dirac surface state of a topological insulator with mid-infrared fields in the MV/cm range. Starting with strong intraband currents, we observe how Floquet sidebands emerge within a single optical cycle. Intraband acceleration simultaneously proceeds in multiple sidebands until high-energy electrons scatter into bulk states and dissipation destroys the Floquet bands. Quantum non-equilibrium calculations explain the simultaneous occurrence of Floquet states with intraband and interband dynamics.

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Suguru Ito, Michael Schüler, Manuel Meierhofer, Stefan Schlauderer, Josef Freudenstein, Johannes Reimann, Dmytro Afanasiev, Konstantin A. Kokh, Oleg E. Tereshchenko, Jens Güdde, Michael A. Sentef, Rupert Huber, and Ulrich Höfer "Birth, rise, and collapse of Floquet-Bloch bands on subcycle time scales", Proc. SPIE PC12884, Ultrafast Phenomena and Nanophotonics XXVIII, PC1288401 (9 March 2024); https://doi.org/10.1117/12.3000356

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