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MA: Fachverband Magnetismus

MA 10: Focus Session: Magnetic Phenomena from Phonon Chirality and Angular Momentum II (joint session MA/TT)

MA 10.11: Vortrag

Dienstag, 18. März 2025, 12:15–12:30, H16

Ultrafast laser-induced carrier and magnetization dynamics in SrTiO₃ from real-time time-dependent DFT — •Andri Darmawan, Markus E. Gruner, and Rossitza Pentcheva — Department of Physics, University of Duisburg-Essen

Recent experimental studies indicate electric-field-driven ferroelectricity [1] and multiferroicity [2] in the paradigmatic nonmagnetic band insulator SrTiO₃ in the terahertz regime. Following a comprehensive study of the optical [3] and x-ray absorption [4] spectra including quasiparticle and excitonic effects, here we explore the response of SrTiO₃ to laser excitation. Using real-time time-dependent density functional theory (RT-TDDFT) as implemented in the Elk code, we investigate both linear and circular polarized laser pulses. A complex site- and orbital-dependent temporal dynamics is observed with opposite sign of fluctuations at O and Ti sites and charge transfer from O 2p to Ti 3d states for linearly polarized light, that breaks dynamically inversion symmetry. Notably, circularly polarized pulses induce a finite transient magnetic moment which is absent for linearly polarized pulses. Funding by DFG within CRC1242 (project C02) and computational time at magnitUDE, amplitUDE and the Leibniz Supercomputer Center (project pr87ro) are gratefully acknowledged.

[1] T.F. Nova et al., Science 364, 1075 (2019)

[2] M. Basini et al., Nature 628, 534 (2024)

[3] V. Begum, M.E. Gruner and R. Pentcheva, Phys. Rev. Mater. 3, 065004 (2019)

[4] V. Begum-Hudde et al., Phys. Rev. Res. 5, 013199 (2023)

Keywords: Ultrafast; Magnetization; Nonmagnetic insulator