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MO: Fachverband Molekülphysik
MO 26: Contributions to SYLC II
MO 26.5: Vortrag
Donnerstag, 5. März 2026, 15:45–16:00, P 110
Enantiosensitive Chern Numbers in Chiral Molecules Driven by Synthetic Chiral Light — •Pablo Maier1, Aycke Roos1, and Olga Smirnova1,2 — 1Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2A, 12489 Berlin, Germany — 2Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
Temporal geometry describes ultrafast chiral dynamics in molecules by showing how light-driven electronic currents depend on molecular orientation. In our driving scheme the electronic response is effectively independent of one Euler angle, so the relevant orientation space reduces to a sphere parametrized by two angles. The driven electronic states then form smooth bands over this sphere, characterized by a Berry connection, Berry curvature, and associated topological invariants. We show that these orientation-space bands can carry integer-quantized, enantio-sensitive Chern numbers. In a driven three-level electronic manifold used as a minimal model, the dressed eigenstates define three non-degenerate bands whose Chern numbers always sum to zero but are individually nonzero and reverse sign upon exchanging enantiomers. By varying detunings and field parameters, we locate band-touching points where gaps close and the band Chern numbers jump by integer amounts, signaling topological phase transitions between distinct chiral phases.
Keywords: Ultrafast chirality; Temporal geometry; Berry curvature; Chern numbers; Synthetic chiral light