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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 18: SrTiO3: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor: Poster (joint session TT/KFM/MA/O)
KFM 18.2: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
Ultrafast second harmonic generation spectroscopy of SrTiO3 surfaces and interfaces — Mahendra Kabbinahithlu, Newsha Vesalimahmoud, Tobias Lojewski, Ping Zhou, Katharina Ollefs, and •Andrea Eschenlohr — Faculty of Physics and CENIDE, University Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
Perovskite oxide heterostructures can exhibit properties at their interfaces that are very different from the bulk, for example a two-dimensional electron gas [1]. These properties emerge from charge carrier localization or charge transfer, which motivates an interface-sensitive analysis of the charge configuration and charge carrier dynamics. Second harmonic generation (SHG) spectroscopy is an interface-sensitive probe in centrosymmetric materials, suitable for the investigation of SrTiO3-based heterostructures [2]. We perform pump-probe SHG spectroscopy with <30 fs time resolution in the visible wavelength range (1.9-2.5 eV) at SrTiO3(001) surfaces as well as LaTiO3/SrTiO3 heterostructures, and discuss the polarization-, wavelength- and time-dependence of the observed SHG response.
[1] H. Y. Hwang, Y. Iwasa, M. Kawasaki, B. Keimer, N. Nagaosa, Y. Tokura, Nat. Mater. 11, 103 (2012).
[2] A. Rubano, D. Paparo, Materials 16, 4337 (2023).
Keywords: strontium titanate; second harmonic generation; pump-probe spectroscopy; ultrafast dynamics