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O: Fachverband Oberflächenphysik

O 41: Topology and symmetry protected materials & Topological insulators – Poster (joint session O/TT)

O 41.3: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

THz-driven nonlinear dynamics studied with high-power THz sources — Atiqa Arshad^1,2, Jan-C Deinert², Igor Ilyakov², Andreas Gebauer², Anjan Kumar N M¹, and •Stefan Kaiser¹ — ¹TU Dresden,Germany — ²HZDR, Dresden,Germany

THz pump-photoelectron spectroscopy (ARPES) probe is currently being implemented at the THz facility TELBE at Helmholtz-Zentrum Dresden-Rossendorf. This unique combination of high-field terahertz excitation and tr-ARPES probe will enable groundbreaking experiments on solid surfaces and interfaces. To this aim we have set up a high-repetition rate THz source driven by a 180 W laser source yielding > 50 mW THz output power. We report on the THz generation and characterization scheme as well as on first experiments. A highly promising material class to be studied with these light sources is BiTeI, a dual topological insulator that exhibits two different types of surface states on different interfaces. We present our study on the complex nonlinear dynamics, in particular THz harmonic generation in these compounds.

Keywords: Terahertz; ARPES; non-linear dynamics; High harmonic generation; topoligical insulator