1State Key Laboratory of Quantum Functional Materials, SUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
2Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, People’s Republic of China
3Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, People’s Republic of China
4Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong 999077, People’s Republic of China
5Center for Computational Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
6National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
Phys. Rev. Lett. 136, 256902 – Published 25 June, 2026
The dynamical control over electronic properties represents a key area of research in condensed-matter physics. Here, we demonstrate all-optical control of carrier-strain-mediated giant enhancement of spin splitting (100 meV) in a chiral 2D perovskite. Ultrafast circular dichroism measurements and ab initio calculations reveal that anisotropic strain from confined photoexcited excitons enhances spin splitting, thereby creating a spin-dependent hot-carrier relaxation pathway and tripling hot-carrier lifetimes. Our findings establish a versatile optical strategy for coherent spin manipulation and open avenues for developing spin-based hot-carrier devices.
