CaltechAUTHORS
Published June 22, 2023 | Version public
Journal Article Metadata-only

Light-Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

Creators

  • 1. ROR icon Institute of Physics
  • 2. ROR icon Ningbo Institute of Industrial Technology
  • 3. ROR icon Shanghai Jiao Tong University
  • 4. ROR icon University of Chinese Academy of Sciences

Abstract

The 2D electron system (2DES) at the KTaO₃ surface or heterointerface with 5d orbitals hosts extraordinary physical properties, including a stronger Rashba spin–orbit coupling (RSOC), higher superconducting transition temperature, and potential of topological superconductivity. Herein, a huge enhancement of RSOC under light illumination achieved at a superconducting amorphous-Hf_(0.5)Zr_(0.5)O₂/KTaO₃(110) heterointerfaces is reported. The superconducting transition is observed with T꜀ = 0.62 K and the temperature-dependent upper critical field reveals the interaction between spin–orbit scattering and superconductivity. A strong RSOC with Bₛₒ = 1.9 T is revealed by weak antilocalization in the normal state, which undergoes sevenfold enhancement under light illumination. Furthermore, RSOC strength develops a dome-shaped dependence of carrier density with the maximum of Bₛₒ = 12.6 T achieved near the Lifshitz transition point nc ≈ 4.1 × 10¹³ cm⁻². The highly tunable giant RSOC at KTaO₃(110)-based superconducting interfaces show great potential for spintronics.

Additional Information

© 2023 Wiley-VCH GmbH. The authors thank Yi Liu and Jian Wang for helpful discussion. Project supported by National Natural Science Foundation of China (No.11888101, 52088101, 51327806, 12204523), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB28000000, XDB07000000), the National Key Research and Development Program of China (2021YFA1400300), the Key Research Program of Frontier Sciences of CAS (Grant No. ZDBS-LY-SLH008), the China Postdoctoral Science Foundation (2020M680726, YJ20200325). This work was supported by the Synergetic Extreme Condition User Facility (SECUF). Data Availability Statement. The data that support the findings of this study are available from the corresponding author upon reasonable request. The authors declare no conflict of interest.

Additional details

Identifiers

Eprint ID
121581
Resolver ID
CaltechAUTHORS:20230526-436866000.26

Funding

National Natural Science Foundation of China
11888101
National Natural Science Foundation of China
52088101
National Natural Science Foundation of China
51327806
National Natural Science Foundation of China
12204523
National Key Research and Development Program of China
2021YFA1400300
Chinese Academy of Sciences
ZDBS-LY-SLH008
China Postdoctoral Science Foundation
2020M680726
China Postdoctoral Science Foundation
YJ20200325

Dates

Created
2023-07-10
Created from EPrint's datestamp field
Updated
2023-07-10
Created from EPrint's last_modified field