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.
Adv Mater. 2023 Jun;35(25):e2300582. doi: 10.1002/adma.202300582. Epub 2023 May 14.
The 2D electron system (2DES) at the KTaO 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 Zr O /KTaO (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 B = 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 = 12.6 T achieved near the Lifshitz transition point n ≈ 4.1 × 10 cm . The highly tunable giant RSOC at KTaO (110)-based superconducting interfaces show great potential for spintronics.
在具有 5d 轨道的 KTaO 表面或异质界面上的二维电子系统（2DES）具有非凡的物理性质，包括更强的拉什巴自旋轨道耦合（RSOC）、更高的超导转变温度和拓扑超导的潜力。在此，报道了在超导非晶-HfZrO/KTaO（110）异质界面下通过光照实现的 RSOC 的巨大增强。超导转变在 T=0.62 K 下观察到，温度相关的上临界场揭示了自旋轨道散射和超导之间的相互作用。在正常状态下通过弱反局域观察到的强 RSOC 为 B=1.9 T，在光照下增强了七倍。此外，RSOC 强度表现出载流子密度的穹顶状依赖性，在接近 Lifshitz 转变点 n≈4.1×10cm 的位置达到最大值 B=12.6 T。基于 KTaO（110）的超导界面上的高可调谐巨型 RSOC 显示出在自旋电子学方面的巨大潜力。
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