Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Correlated Magnetism – Dynamics and Spectroscopy

TT 33.1: Talk

Tuesday, March 10, 2026, 11:00–11:15, HSZ/0105

Nonlinear spectroscopy of spiral magnets — •Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany

Spin systems with noncollinear long range order (NCLRO) allow for light-matter coupling via effective dipole moments which stem from the inverse Dzyaloshinskii-Moriya interaction. This permits to explore spin excitations of quantum magnets using time-dependent electric fields, which is of particular interest in the nonlinear regime, where second harmonic generation and two-dimensional spectroscopy may provide insight into the dynamics beyond linear probes. Here, we present results for such nonlinear response functions, using spin-wave theory and considering quasi two-dimensional magnets with NCLRO arising from frustration.

Keywords: Frustrated magnetism; Magnetoelectric effect; Nonlinear optical susceptibility; Spin wave theory; Noncollinear magnets