Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Focus Session: Surfaces and Interfaces of (Incipient) Ferroelectrics (joint session O/KFM)

KFM 17.10: Topical Talk

Mittwoch, 7. September 2022, 18:00–18:30, H3

Spin-orbitronics and superconductivity in KTaO3 twodimensional electron gases — •Srijani Mallik1, Gerbold Ménard2, Guilhem Saiz2, Hugo Witt1,2, Sara Varotto1, Luis M. Vicente-Arche1, Julien Bréhin1, Annika Johansson3, Börge Göbel4, Raphaël Salazar5, Ingrid Mertig4, Lara Benfatto6, Nicolas Bergeal2, and Manuel Bibes11Unité Mixte de Physique CNRS/Thales, Palaiseau, France — 2LPEM ESCPI, Paris, France — 3MPI, Halle, Germany — 4Martin-Luther-Universitat Halle-Wittenberg, Germany — 5Synchrotron SOLEIL, France — 6Sapienza University of Rome, Italy

Similar to SrTiO3 (STO) recent research has shown that KTaO3 (KTO) may also harbor a 2DEG at interfaces with several oxide materials. Due to the presence of Ta (5d element), it is expected that the Rashba spin-orbit coupling in KTO 2DEGs should be larger than in STO 2DEGs. Further, (110) and (111)-oriented KTO 2DEG show superconductivity at temperature a factor of ca. 10 higher than in STO 2DEGs. In this talk we will show that 2DEGs can be generated by the simple deposition of Al metal on KTO single crystals. We will report their electronic band structure by angle-resolved photoemission spectroscopy, evidencing a peculiar Rashba splitting. We will show that this Rashba state can be harnessed to achieve very efficient spin-charge interconversion. Finally, we will present microwave impedance spectroscopy measurements of the superconducting condensate and discuss the nature of superconductivity in these systems.

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