Unconventional Shubnikov-de Haas oscillations at the EuO/KTaO<sub>3</sub> interface

ORAL

Abstract

The coexistence of electric-field controlled superconductivity and spin-orbit interaction in two-dimensional electron gas (2DEG) based on complex oxides (e.g., SrTiO3 and KTaO3) hold great promise for advancement in spintronics and quantum computing. However, a comprehensive understanding of the electronic structure that gives rise to the multifunctional character of these 2DEG remains elusive.

To address this, we recently investigated Shubnikov-de Haas oscillations in EuO/KTaO3 in high magnetic fields (60 T) and at low temperatures (0.5 K). Remarkably, we observed a progressive increase in cyclotron mass and oscillation frequency with the magnetic field, indicating the presence of non-trivial electronic bands induced by spin-orbit interaction [1]. Besides providing experimental evidence for non-trivial electronic states in oxides-2DEG, these findings shed light on the recent predictions of topological states in the 2DEG based on similar perovskite transition metal oxides.

*We acknowledge support from the National High Magnetic Field Laboratory, supported by the National Science Foundation through NSF/DMR-1644779 and the State of Florida, and the US Department of Energy "Science of 100 Tesla" BES program.

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Publication: K. Rubi et al., arXiv:2307.04854 (2023).

Presenters

  • KM RUBI

    • Los Alamos National Laboratory

Authors

  • KM RUBI

    • Los Alamos National Laboratory

  • Manish Dumen

    • Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Mohali, Punjab

  • Suvankar Chakraverty

    • Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Mohali, Punjab
    • Institute of Nano Science and Technology, Mohali

  • Mun K Chan

    • Los Alamos National Laboratory

  • Neil Harrison

    • Los Alamos National Laboratory (LANL)
    • Los Alamos Natl Lab