Optical spin pumping induced pseudomagnetic field in two-dimensional heterostructures

• Main Authors: Jiang, Chongyun, Abdullah Rasmita, Xu, Weigao, Imamoğlu, Atac, Xiong, Qihua, Gao, Wei-bo
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics; Mesoscopic Systems; Quantum Hall Effect
• Online Access: https://hdl.handle.net/10356/140575
• Institution: Nanyang Technological University

Two-dimensional heterostructures are likely to provide new avenues for the manipulation of magnetization that is crucial for spintronics or magnetoelectronics. Here, we demonstrate that optical spin pumping can generate a large effective magnetic field in two-dimensional MoSe2/WSe2 heterostructures. We determine the strength of the generated field by polarization-resolved measurement of the interlayer exciton photoluminescence spectrum: the measured splitting exceeding 10 millielectron volts (meV) between the emission originating from the two valleys corresponds to an effective magnetic field of ∼30 T. The strength of this optically induced field can be controlled by the excitation light polarization. Our finding opens up possibilities for optically controlled spintronic devices based on van der Waals heterostructures.