Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO3(110) Heterointerfaces
Source abstract
Abstract
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‐Hf0.5Zr0.5O2/KTaO3(110) heterointerfaces is reported. The superconducting transition is observed with Tc = 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.
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Research context
OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beijing National Laboratory of Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China
Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering (NIMTE) Chinese Academy of Sciences Ningbo 315201 China
Tsung‐Dao Lee Institute & School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China
CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China · China Postdoctoral Science Foundation
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