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Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 83: SrTiO3: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor III (joint session TT/KFM/MA/O)

TT 83.5: Vortrag

Freitag, 22. März 2024, 10:30–10:45, H 0104

Origin of spin-polarized 2DEG at the EuTiO3(001) surface and LaAlO3/EuTiO3/SrTiO3(001) interface — •Manish Verma and Rossitza Pentcheva — Department of Physics, Universität Duisburg-Essen

Since the discovery of a two-dimensional electron gas (2DEG) at the interface between the LaAlO3 and SrTiO3 band insulators, studies on oxide surfaces and interfaces uncovered an intriguing and rich physics, such as possible magnetism in 2DEG. Using density functional theory with an on-site Coulomb repulsion term U, we find a spin-polarized 2DEG at the EuTiO3(001) surface arising from the interplay of ferromagnetic (FM) order of Eu-4f magnetic moments and the localization of electrons released from oxygen divacancies at the surface Ti sites, in agreement with in situ high-resolution angle-resolved photoemission [1]. The 2DEG at the LaAlO3/EuTiO3/SrTiO3(001) interface is formed due to the polar discontinuity. The spin-polarization is due to the FM exchange interaction between Eu 4f and Ti 3d states and steers the occupation of dxz/dyz orbitals [2].

[1] R. Di Capua et al., Phys. Rev. Research 3 (2021) L042038

[2]. R. Di Capua et al., npj Quantum Mater. 7 (2022) 41

Keywords: Two-dimensional electron gas; defects

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