SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: Focus Session: Ultrafast Dynamics in Nanostructures II
O 83.3: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, GER 38
Description of High Garmonic Generation in Quantum Dots using a Tight-Binding approach — •Martin Thümmler1, Alexander Croy1, Stefanie Gräfe1, and Ulf Peschel2 — 1Institute of Physical Chemistry, University of Jena — 2Institute of Condensed Matter Theory and Optics, University of Jena
Recently, high harmonic generation (HHG) was experimentally observed in quantum dots showing striking differences compared to HHG in molecules and bulk materials. At the same time, the available theoretical tools (like semiconductor Bloch-equations and real-time density-functional theory (DFT)) have proven to be insufficient to describe the size dependence of the nonlinear response of these nanostructures. Here, we present a computationally feasible, real-space tight-binding method to account for the description of inter- and intraband harmonics, and ionization effects, while all model parameters are derived from DFT calculations. Inspired by recent experiments, we present first simulation results of HHG in 3D CdSe quantum dots for linear and elliptic polarization of the driving laser.