Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 30: SrTiO₃: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor III (joint session TT/KFM/MA/O)

KFM 30.7: Vortrag

Freitag, 22. März 2024, 11:00–11:15, H 0104

Magnetotransport properties of a spin polarized STO-based 2D electron system tuned by visible light — Maria D’Antuono^1,2, Yu Chen², Roberta Caruso^1,2,3, Benoit Jouault⁴, Marco Salluzzo², and •Daniela Stornaiuolo^1,2 — ¹Department of Physics, University of Naples Federico II, Italy. — ²CNR-SPIN, Naples, Italy. — ³Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, NY, USA. — ⁴Laboratoire Charles Coulomb, CNRS,Université de Montpellier, France

Two-dimensional electron systems (2DES) developing in STO-based heterostructures possess a wide range of properties which are largely tunable thanks to the systems band structure and carrier density. In LaAlO₃/EuTiO₃/SrTiO₃ (LAO/ETO/STO) heterostructure, for instance, the charge carriers, above a critical value, start to fill Ti-3d bands with d_xz,yz character, leading to the stabilization of a ferromagnetic order of Ti and Eu magnetic moments, and to a spin polarization of the 2DES. In this work we show that such mechanism can be achieved not only using electric field effect, but also using visible light irradiation. Furthermore, the analysis of the Anomalous Hall effect and of magnetocodnuctance curves demonstrate that visible light irradiation leads to enhanced stabilization of ferromagnetic correlations in the 2DES. Our results establishs the combined use of visible light and gate voltage as a straightforward way to access unexplored regions of the LAO/ETO/STO 2DES phase diagram.

Keywords: oxide 2DES; magnetotransport