Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Poster: SrTiO₃: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor (joint session TT/KFM/MA/O)

O 62.2: Poster

Mittwoch, 20. März 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