DPG (Deutsche Physikalische Gesellschaft e. V.)

Mittwoch, 20. März 2024, 12:15–12:30, A 151
Confinement of magnetic solitons and edge states in van-der Waals FeOCl — •Angela Möller1, Martin Panthöfer1, Stefanie Berinskat1, Fabian Predelli2, and Peter Lemmens2 — 1Dept. Chemistry, JGU Mainz, Mainz, Germany — 2IPKM, TU Braunschweig, Braunschweig, Germany

In a comparative and systematic study of the isostructural van-der Waals materials ScOCl, ScOBr, FeOCl, the origin of unconventional magnetic properties of FeOCl has been investigated. Evidence for a size dependent order parameter and fluctuations are found in Mössbauer and Raman spectroscopy in conjunction with thermodynamic data and X-ray diffraction. We discuss our data in relation to soliton condensation into topological edge states.

Funding by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) under the projects 443703006 (CRC 1487) and 442589410 is gratefully acknowledged. PL and FP acknowledge support by DFG GrK 1952/2, Metrology for Complex Nanosystems-NanoMet and DFG EXC-2123 QuantumFrontiers - Light and Matter 390837967.


TT 44.5: Vortrag, Mittwoch, 20. März 2024, 12:30–12:45, H 3007

Double resonance of twisted photon states and related transfer of orbital angular momentum to chiral model systems — Silvia Müllner1, •Peter Lemmens1, and Angela Möller2 — 1IPKM, TU-BS, Braunschweig, Germany — 2Dept. Chemistry, JGU Mainz, Germany

Twisted photon states that contain spin (helicity) and orbital angular momentum (chirality) are used to probe topological properties of chiral model systems. As the latter we recently identified chiral liquid crystals [1]. Their optical properties are dominated by a twistedness with a pitch length tailored both by temperature and composition. Using these two parameters as well as curved interfaces introduced by dispersed nanoparticles we establish resonances of pitch length with the geometry as well as with the OAM transfer.

Work supported by DFG GrK 1952/2, Metrology for Complex Nanosystems, NanoMet and DFG EXC-2123 QuantumFrontiers - Light and Matter 390837967.
[1] S. Müllner, et al., Phys. Rev. Lett. 129 (2022) 207801.