Light-Induced Giant Rashba Spin-Orbit Coupling at Superconducting KTaO<sub>3</sub> (110) Heterointerfaces.
basic_science · Level V
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- Record sourced from PubMed, PMID 36972144.
- Also identified by DOI 10.1002/adma.202300582.
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Abstract
The 2D electron system (2DES) at the KTaO<sub>3</sub> 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<sub>0.5</sub> Zr<sub>0.5</sub> O<sub>2</sub> /KTaO<sub>3</sub> (110) heterointerfaces is reported. The superconducting transition is observed with T<sub>c</sub> = 0.62 K and the temperature-dependent upper critical field reveals the interaction between spin-orbit scattering and superconductivity. A strong RSOC with B<sub>so</sub> = 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 B<sub>so</sub> = 12.6 T achieved near the Lifshitz transition point n<sub>c</sub> ≈ 4.1 × 10<sup>13</sup> cm<sup>-2</sup> . The highly tunable giant RSOC at KTaO<sub>3</sub> (110)-based superconducting interfaces show great potential for spintronics.