@article{Ye2026, 
author = {Ying Ye and Mengyu Liu and Jian Huang and Jingwen Guo and Yuxiang Zhang and Wei Wu and Jiangpeng Zhou and Boyu Zhou and Chenhao Zhang and Xuanli Zheng and Xu Li and Yaping Wu and Zhiming Wu and Junyong Kang},
title = {Giant valley polarization splitting and circular dichroism response in WS2/CrBr3 heterostructure via ultrafast spin-charge transfer},
year = {2026},
journal = {Nano Research},
keywords = {exciton dynamics, valley polarization, graphene proximity coupling, conduction band offset, spin-charge transfer},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908802},
doi = {10.26599/NR.2026.94908802},
abstract = {Manipulation of exciton dynamics is a fundamental approach for exploiting the valley degree of freedom in two-dimensional van der Waals (vdWs) heterostructures and developing high-performance valleytronic devices. Herein, we report a method for controlling interlayer spin-charge transfer in WS2/CrBr3 vdWs heterostructure through graphene proximity coupling and achieve a giant chirality-dependent valley polarization splitting. Theoretical and experimental findings reveal that the WS2/CrBr3 vdWs heterostructure retains its initial large conduction band offset under light irradiation when it is coupled with a few-layered graphene in the bottom. The interlayer spin-charge transfer time is significantly reduced from 17.3 ps to 1.3 ps, leading to a remarkable improvement in the valley polarization. The degree of valley polarization and polarization splitting of trion excitons in WS2 are enhanced by 32% and 261%, respectively. Moreover, a highly sensitive circularly polarized photodetector was developed by using the WS2/CrBr3/graphene heterostructure. This work pioneers a route to efficiently manipulate the transport behavior of excitons in vdWs heterostructures and also offers a novel idea for designing high-performance spintronic devices.}
}