Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Oxide Semiconductors II
HL 52.4: Vortrag
Donnerstag, 20. März 2025, 15:45–16:00, H14
Spintronic properties of the two-dimensional electron gas in KTaO3-based heterostructures. — •Sonali Kakkar1 and Chandan Bera2 — 1Department of Physics, Noida Institute of Engineering and Technology, 19, Institutional Area, Knowledge Park II, Greater Noida, Uttar Pradesh 201306, India — 2Institute of Nano Science and Technology, Sector-81, Knowledge City, Sahibzada Ajit Singh Nagar, Punjab, 140306, India
A two-dimensional electron gas (2DEG) in oxide interfaces offers a single platform for a wide range of functionalities. Compared to STO-based 3d-2DEG, 2DEG in the polar perovskite oxide KTaO3 (KTO) with 5d-t2g orbitals shows a greater atomic spin-orbit coupling. Moreover, the electronic and spintronic properties of oxide heterostructures are greatly influenced by the inherent crystal structure symmetry. In this work, we have investigated the electronic and spintronic properties in KTO-based heterostructures using density functional theory calculations with the Hubbard parameter (DFT+U). The dependence of the Rashba spin-splitting and the corresponding spin texture in the reciprocal space for 2DEG at the KTO surface and LVO/KTO interface on the crystal orientation highlights the importance of crystal symmetry for the 5d-2DEG in KTO [1]. Furthermore, highly confined, spin-polarized 2DEG at the interfacial TaO2 layer in the 5dxy orbitals of Ta at the interface between the ferromagnetic insulator EuO and the non-magnetic KTO shows Rashba spin texture [2]. [1] S. Kakkar, et al., Physica E Low Dimens. Syst. Nanostruct. 144, 115394 (2022). [2] S. Kakkar, et al., Adv. Phys. Res. 2, 2200026 (2023).
Keywords: oxide interface; DFT; two dimensional electron gas; rashba splitting; spin texture