SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster: Ultrafast Electron Dynamics at Surface and Interfaces II
O 37.6: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Magnetic field effects on ultrafast driven electrons in topological insulator surface states — •Alexander Riedel1, Vanessa Junk1, Wolfgang Hogger1, Cosimo Gorini2, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg, Germany — 2Universite Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France
When strong-field light pulses of various durations and shapes interact with a solid, their electric field component acts as an a.c. bias accelerating electrons through the bandstructure and driving non perturbative transitions. These processes can lead to high-order harmonic emission of radiation which encodes characteristic properties of the underlying material.
However, in the vast majority of cases the magnetic field component of the pulse is completely neglected in theoretical descriptions. In this contribution we incorporate a magnetic field into the description by adding a Zeeman term into an effective minimal model Hamiltonian describing the surface states of the topological insulator material bismuth telluride. We present how magnetic field components influence the Berry curvature and the transitions induced by the pulse. The resulting currents and higher harmonic spectra are discussed and compared to those in the absence of magnetic field effects. All statements rely on both a semiclassical analysis and full quantum mechanical simulations.