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MA: Fachverband Magnetismus
MA 5: Focus Session: Magnetic Phenomena from Phonon Chirality and Angular Momentum I (joint session MA/TT)
MA 5.3: Invited Talk
Monday, March 17, 2025, 10:30–11:00, H20
Geometry of temporal chiral structures and photoinduced chirality-spin coupling — •Olga Smirnova1,2,3, Philip Flores1, Aycke Roos1, David Ayuso4, Piero Decleva5, Stefanos Carlstroem1, Serguei Patchkovskii1, and Andres Ordonez4 — 1Max-Born Institute, Berlin — 2Technische Universität Berin — 3Technion - Israeli Institute of Technology, Haifa, Israel — 4Imperial College London, UK — 5CNR IOM and Dipartimento di Scienze Chimiche e Farmaceutiche, Universita degli Studi di Trieste, Italy
In non-relativistic physics the concepts of geometry and topology are usually applied to characterize spatial structures, or structures in momentum space. We introduce the concept of temporal geometry [1], which encompasses geometric and topological properties of temporal shapes, e.g. trajectories traced by a tip of a time-dependent vector on sub-cycle time scale, and apply it to light-driven ultrafast electron currents in chiral molecules. The geometric concepts: curvature and connection emerge as ubiquitous features of photoexcited chiral electron dynamics. To demonstrate the link between the geometric fields and spin, we extend the concept of curvature to spin-resolved photoionization, and show that it is responsible for enantio-sensitive locking of the cation orientation to the photoelectron spin. This translates into chirality induced spin selectivity in photoionization of oriented chiral molecules both in one photon and two-photon processes.
[1] Geometry of temporal chiral structures, A. F. Ordonez, A. Roos, P. Mayer, D.Ayuso, O. Smirnova, arXiv preprint arXiv:2409.02500, 2024
Keywords: Chirality; Spin-chirality coupling; Photoionization; Berry curvature; Berry phase