Experimental evidence of t<sub>2g</sub> electron-gas Rashba interaction induced by asymmetric orbital hybridization

ORAL

Abstract

We report the control of Rashba spin-orbit interaction by tuning asymmetric hybridization between Ti-orbitals at the LaAlO3/SrTiO3 interface. This asymmetric orbital hybridization is modulated by introducing a LaFeO3 layer between LaAlO3 and SrTiO3, which alters the Ti-O lattice polarization and traps interfacial charge carriers, resulting in a large Rashba spin-orbit effect at the interface in the absence of an external bias. This observation is verified through high-resolution electron microscopy, magneto-transport and first-principles calculations. Our results open hitherto unexplored avenues of controlling Rashba interaction to design next-generation spin-orbitronics.

*This research is supported by the Agency for Science, Technology and Research (A*STAR) under its Advanced Manufacturing and Engineering (AME) Individual Research Grant (IRG) (A2083c0054). The authors also acknowledge the National Research Foundation (NRF) of Singapore under its NRF-ISF joint program (Grant No. NRF2020-NRF-ISF004-3518) for financial support and the Centre for Advanced 2D Materials at National University of Singapore for providing computing resources.

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Publication: 1. G. J. Omar et al., Nano Lett. 20, 2493 (2020).
2. G. J. Omar et al., Phys. Rev. Lett. 129, 187203 (2022).

Presenters

  • Ganesh Ji Omar

    • Natl Univ of Singapore

Authors

  • Ganesh Ji Omar

    • Natl Univ of Singapore

  • Ariando Ariando

    • Natl Univ of Singapore

  • Hariom Jani

    • University of Oxford

  • Weilong Kong

    • Natl Univ of Singapore

  • Zhi Shiuh Lim

    • Natl Univ of Singapore

  • Saurav Prakash

    • National University of Singapore

  • Sonu Hooda

    • Natl Univ of Singapore
    • National University of Singapore

  • Thirumalai V Venkatesan

    • University of Oklahoma

  • Yuan P Feng

    • National University of Singapore
    • Natl Univ of Singapore

  • Stephen J Pennycook

    • Natl Univ of Singapore

  • LEI SHEN

    • Natl Univ of Singapore