Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 37: Poster IV

HL 37.26: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster F

Tuning the optical properties and transient dynamics of antimony through external fields — •Joel Billermann, Sebastian Walfort, Niklas Vollmar, and Martin Salinga — University of Münster, Institute of Materials Physics, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany

The crystal structure of antimony is characterized by a Peierls distortion motif resulting from a subtle energy balance between the electronic and atomic subsystems [1]. Perturbing this energy balance through the impulsive excitation of a small fraction of valence electrons leads to large structural changes towards a more symmetric phase and the displacive excitation of coherent phonons [2]. The system then decays back to the distorted structure within picoseconds. In our present study, we explore schemes to permanently shift the potential energy landscape of antimony towards the symmetric phase by applying external electric and strain fields. We use steady-state- and femtosecond pump-probe spectroscopy to elucidate the influence of structural distortion on both the optical properties and the ultrafast photoinduced dynamics of antimony, e.g. the coupling of the electron system to the lattice.

[1] U. Argaman et al., J Phys Condens Matter 31, 465501 (2019)

[2] H. J. Zeiger et al., Phys. Rev. B 45, 768 (1992)

Keywords: Peierls distortion; Antimony; pump probe spectroscopy; photoinduced dynamics; field effect