Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster – Interaction with Strong or Short Laser Pulses (joint session A/MO)

MO 21.9: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

High-Harmonics Spectroscopy of Vibrating Chains — •Gabriel Caceres-Aravena and Dieter Bauer — Institute of Physics, University of Rostock, 18051 Rostock, Germany

In this work, we study the High-Harmonic Generation (HHG) of the laser-driven Su-Schrieffer-Heeger (SSH) chain where the electrons are coupled to the local phonons. The electron dynamics is implemented using the tight-binding approximation and the electron-phonon interaction is implemented through the Holstein model, where the local vibrations of ions are approximated to be solutions of the quantum harmonic oscillator. In our simulations we observe that the electrons move accelerated by the electric field from the driving laser, as expected, and also we observe that the phonons move following the electron movement, showing the existence of a polaron. Also, when we introduce phonons to the system, we observe from the eigenenergy spectrum that new states emerge. Transitions to these new states allow for more efficient harmonic generation for certain harmonic orders.

Keywords: High-Harmonic Generation; Polaron