Spin detector for panchromatic circularly polarized light detection
Lvpeng Yang, Yerun Gao, Zhenye Wang, Long Yang, Ming Shao
Abstract
Circularly polarized light (CPL) detection is crucial for optical communication, bioimaging and quantum computing. However, CPL detectors based on chiral low-dimensional perovskites face a trade-off between optoelectronic performance and CPL discrimination, and typically exhibit a CPL response within a narrow spectral range. Here, we overcome these limitations by integrating three-dimensional (3D) and chiral-two-dimensional (2D) perovskites. The 3D perovskite serving as the photoabsorption layer extends the detection range to 760 nm and enhances optoelectronic responses, while also generating spin-polarized carriers through large Rashba splitting. The chiral-2D perovskite achieves spin filtering efficiency up to 80%. The synergy between spin polarization and chiral-induced spin selectivity processes enables a panchromatic CPL response, with a photocurrent asymmetry factor exceeding 0.28 across the visible spectrum and peaking at 0.35. Furthermore, our detector achieves a detectivity of 3.7×1011 Jones. Our work introduces a spin manipulation strategy for panchromatic CPL detection, expanding the scope of spintronics applications. Circularly polarized light (CPL) detectors based on chiral low-dimensional perovskites typically exhibit CPL response within a narrow spectral range. Here, the authors integrate 3D and chiral 2D perovskites, enabling an unusual panchromatic response and detectivity of 3.7×1011 Jones in the detector.