Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Correlated Magnetism – Dynamics and Spectroscopy
TT 33.4: Vortrag
Dienstag, 10. März 2026, 11:45–12:00, HSZ/0105
Exploring the Nonlinear Magnetic Response of FeI2 via Two-Dimensional Coherent Spectroscopy — •Sagar Ramchandani1, Yoshito Watanabe1, Simon Trebst1, and Ciarán Hickey2 — 1Institute for Theoretical Physics, University of Cologne, Cologne, Germany — 2School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
Nonlinear THz spectroscopy has emerged as a powerful method to extract new information beyond conventional linear response. In this work, we employ a semi-classical approach to 2-dimensional coherent spectroscopy (2DCS), implemented in the context of the Sunny Julia package for modelling atomic-scale magnetism. We apply this framework to explore the nonlinear response of FeI2, a 2D spin-1 antiferromagnet with hybridized dipolar-quadrupolar fluctuations, to reveal its rich nonlinear dynamics.
Keywords: Nonlinear Spectroscopy; 2DCS; Multipolar excitations