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MA: Fachverband Magnetismus

MA 25: Focus Session: Chiral phonons and crystals coupled to magnetic order I

MA 25.8: Vortrag

Mittwoch, 11. März 2026, 12:15–12:30, HSZ/0002

THz field-induced magnetic-like response in the quantum paraelectric diamagnet KTaO₃ — •Christelle Kadlec¹, Filip Kadlec¹, Dalibor Repček¹, Martina Basini², Petr Kužel¹, Jan-Christoph Deinert³, Sergey Kovalev³, Mattia Udina⁴, Igor Ilyakov³, Alexey Ponomaryov³, and Stanislav Kamba¹ — ¹Institute of Physics, Prague, Czechia — ²ETH Zurich, Switzerland — ³HZDR, Dresden, Germany — ⁴CESQ-ISIS, Strasbourg, France

The current efforts on developing new ways of data manipulation are aimed at ultrafast control of magnetization in magnetic materials, as well as at inducing magnetic moments in diamagnetics. We demonstrate that in the diamagnetic quantum paraelectric KTaO₃, the electric field of circularly polarized THz pulses with an amplitude of 300 kV/cm induces a transient magnetic-like response by resonantly pumping its degenerate soft phonon. The transient phonon-mediated magnetic-like response was measured via the rotation of the polarisation of a probe light. However, such response usually contains contributions from both the magneto-optic THz-field-induced Faraday effect and the electro-optic THz-field-induced Kerr effect (TKE). In order to distinguish between them, we separately measured the TKE by applying a linearly polarized THz pump beam. Moreover, we present a theoretical analysis of the TKE, showing that its contribution can be suppressed by subtracting the experimental data generated by opposite elliptically polarized THz radiation. Thus, we are able to unambiguously identify a magnetic-like behavior of the KTaO₃ crystal manifested by the extracted Faraday rotation.

Keywords: THz pump; magnetic-like behavior; THz-field-induced Kerr effect (TKE); THz-field-induced Faraday effect (TFE); THz-phonon-induced magnetic moment