Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Ultrafast Electron Dynamics at Surfaces and Interfaces III
O 23.1: Vortrag
Dienstag, 19. März 2024, 10:30–10:45, MA 041
Emergence of Floquet band structure in Dirac Hamiltonians by short pulse irradiation — •Yuriko Baba1, Alejandro Sebastián Gómez2, Vanessa Junk3, Francisco Domínguez-Adame4, Rafael A. Molina2, and Klaus Richter3 — 1Universidad Autónoma de Madrid, Madrid, Spain — 2Instituto de Estructura de la Materia, IEM-CSIC, Madrid, Spain — 3Fakultät für Physik, Universität Regensburg, Germany — 4GISC, Universidad Complutense de Madrid, Madrid, Spain
Floquet theory is a well-established approach to describe time-dependent quantum systems driven by a periodic external field. In the presence of such a driving, the spectrum of the system is described by replicas of the original dispersion, shifted by integers of the driving frequency [1]. Using the Floquet formalism, this work studies the emergence of the Floquet structure in the energy spectrum of Dirac Hamiltonians subject to short pulses in order to understand the limits of this formalism as well as to interpret recent results of subcycle lightwave-ARPES [2].
[1] V. Junk, P. Reck, C. Gorini, K. Richter, Physical Review B, 101, 134302 (2020). [2] S. Ito, et al, Nature, 616, 696 (2023).
Keywords: Floquet band structure; Dirac materials; Floquet–Bloch bands; t-t' formalism; Topological insulators