Light-induced giant enhancement of nonreciprocal transport at KTaO3-based interfaces

Xu Zhang, Tongshuai Zhu, Shuai Zhang, Zhongqiang Chen, Anke Song, Chong Zhang, Rongzheng Gao, Wei Niu, Yequan Chen, Fucong Fei, Yilin Tai, Guoan Li, Binghui Ge, Wenkai Lou, Jie Shen, Haijun Zhang, Kai Chang, Fengqi Song (), Rong Zhang () and Xuefeng Wang ()
Additional contact information
Xu Zhang: Nanjing University
Tongshuai Zhu: Nanjing University
Shuai Zhang: Nanjing University
Zhongqiang Chen: Nanjing University
Anke Song: Nanjing University
Chong Zhang: Nanjing University
Rongzheng Gao: Nanjing University
Wei Niu: Nanjing University
Yequan Chen: Nanjing University
Fucong Fei: Nanjing University
Yilin Tai: Anhui University
Guoan Li: Chinese Academy of Sciences
Binghui Ge: Anhui University
Wenkai Lou: Chinese Academy of Sciences
Jie Shen: Chinese Academy of Sciences
Haijun Zhang: Nanjing University
Kai Chang: Chinese Academy of Sciences
Fengqi Song: Nanjing University
Rong Zhang: Nanjing University
Xuefeng Wang: Nanjing University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Nonlinear transport is a unique functionality of noncentrosymmetric systems, which reflects profound physics, such as spin-orbit interaction, superconductivity and band geometry. However, it remains highly challenging to enhance the nonreciprocal transport for promising rectification devices. Here, we observe a light-induced giant enhancement of nonreciprocal transport at the superconducting and epitaxial CaZrO3/KTaO3 (111) interfaces. The nonreciprocal transport coefficient undergoes a giant increase with three orders of magnitude up to 105 A−1 T−1. Furthermore, a strong Rashba spin-orbit coupling effective field of 14.7 T is achieved with abundant high-mobility photocarriers under ultraviolet illumination, which accounts for the giant enhancement of nonreciprocal transport coefficient. Our first-principles calculations further disclose the stronger Rashba spin-orbit coupling strength and the longer relaxation time in the photocarrier excitation process, bridging the light-property quantitative relationship. Our work provides an alternative pathway to boost nonreciprocal transport in noncentrosymmetric systems and facilitates the promising applications in opto-rectification devices and spin-orbitronic devices.

Date: 2024
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DOI: 10.1038/s41467-024-47231-6

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