Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 59: 2D Materials V – Magnetic, spintronic, and topological properties (joint session HL/TT)
TT 59.3: Talk
Wednesday, March 11, 2026, 15:45–16:00, POT/0081
Nonlinear optical probing of local quantum geometry — •Nele Tornow1, Paul Herrmann1, Clemens Schneider2, Jan Wilhelm2, and Giancarlo Soavi1,3 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Jena, Germany — 2Institute of Theoretical Physics and Regensburg Center for Ultrafast Nanoscopy, Regensburg, Germany — 3Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, Germany
With its direct relation to many phenomena in solid matter, quantum geometry has become a concept of increasing interest in solid state physics. However, measurements of the local quantum geometry, e.g., Berry curvature, has been possible to date only via angle-resolved photoemission spectroscopy [1]. On the other hand, in one of our recent theoretical works [2] we have shown that there is a link between linear circular dichroism and derivatives of Berry curvature in 3D crystals with preserved time-reversal symmetry (TRS).
In this presentation I will further demonstrate both, experimentally and with analytical solutions of semiconductor Bloch equations, that in a 2D semiconductor with broken TRS, the emerging second-harmonic circular dichroism can be used as a direct probe of the Berry curvature at the opposite ± K valleys, providing a new all-optical approach to access the local quantum geometry in 2D materials.
[1] Schüler, M. et al., Sci. Adv. 6, eaay2730 (2020)
[2] Soavi, G. and Wilhelm, J., arXiv:2501.03684 (2025)
Keywords: local quantum geometry; Berry curvature; Circular Dichroism; Nonlinear Optics; 2D materials