SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Ultrafast Magnetization Effects II
MA 46.10: Vortrag
Freitag, 31. März 2023, 11:45–12:00, HSZ 02
Slow dynamics from ultrafast phononic driving in CuGeO3 — •Leonie Spitz1, Eugenio Paris1, Flavio Giorgianni1, Bruce Normand1, Thorsten Schmitt1, and Christian Rüegg1,2,3,4 — 1Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland — 2Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland — 3Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — 4Institute of Quantum Electronics, ETH Zürich, CH-8093 Hönggerberg, Switzerland
The coherent manipulation of magnetism by optically driven phonons is a rapidly growing field [1-4]. However, experimental studies of quantum spin systems by ultrafast pump-probe schemes remain rare, because the most common optical techniques to probe magnetic phenomena fail in the absence of magnetic order. We present a multi-method study of the spin-chain material CuGeO3, in which the magnetic correlations are associated with a lattice instability, also called the spin-Peierls (SP) transition, that drives the system into a collective singlet ground state of spin dimers [5]. By the coherent driving of phonons we observe low-frequency dynamics of the optical response which may offer new insight into the mechanism driving the SP transition in CuGeO3, a problem that has remained unsolved for almost 3 decades.
[1] T. F. Nova et al., Nat. Phys. 13, 132-136 (2017). [2] A. S. Disa et al., Nat. Phys. 16, 937-941 (2020). [3] D. Afansiev et al., Nat. Mater. 20, 607-611 (2021). [4] F. Giorgianni et al., arXiv:2101.01189 (2021). [5] M. Hase et al., Phys. Rev. Lett. 70, 3651 (1993).