Light-Induced Phonon-Mediated Magnetization in Monolayer MoS$_{2}$
Shengjie Zhang1,2, Yufei Pei4, Shiqi Hu1, Na Wu1,2, Da-Qiang Chen1,2, Chao Lian5,6, and Sheng Meng1,2,3*
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China 3Songshan Lake Materials Laboratory, Dongguan 523808, China 4Department of Physics, University of Oxford, Oxford OX2 6QA, United Kingdom 5Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, USA 6Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA
Abstract：Light-induced ultrafast spin dynamics in materials is of great importance for developments of spintronics and magnetic storage technology. Recent progresses include ultrafast demagnetization, magnetic switching, and magnetic phase transitions, while the ultrafast generation of magnetism is hardly achieved. Here, a strong light-induced magnetization (up to $0.86\mu_{\scriptscriptstyle{\rm B}}$ per formula unit) is identified in non-magnetic monolayer molybdenum disulfide (MoS$_{2}$). With the state-of-the-art time-dependent density functional theory simulations, we demonstrate that the out-of-plane magnetization can be induced by circularly polarized laser, where chiral phonons play a vital role. The phonons strongly modulate spin-orbital interactions and promote electronic transitions between the two conduction band states, achieving an effective magnetic field $\sim$ $380$ T. Our study provides important insights into the ultrafast magnetization and spin-phonon coupling dynamics, facilitating effective light-controlled valleytronics and magnetism.
2023, Vol. 40 
