Spin direction controlled electronic band structure in two dimensional ferromagnetic materials

  • [2018-07-04]

    Speaker: Prof. ZHONG Zhicheng
    Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
    Time: 2018-07-04 15:30
    Place: Exhibition Hall, Hefei National Laboratory Building

    Detail:

    Abstract:
      Manipulating physical properties using the spin degree of freedom constitutes a major part of modern condensed matter physics and is very important for spintronics devices. Using the newly discovered two dimensional van der Waals ferromagnetic CrI3 as a prototype material, we theoretically demonstrated a giant magneto band structure (GMB) effect that a change of magnetization direction significantly modifies electronic band structure. Our density functional theory calculations and model analysis reveal that reorienting the magnetic moment of CrI3 from out-of-plane to in-plane causes a direct-to-indirect bandgap transition, inducing a magnetic field controlled photoluminescence. Our results also show a significant change of Fermi surface with different magnetization directions, leading to giant anisotropic magnetoresistance. What is more, the spin reorientation is found to modify the topological states. Given that a variety of properties are determined by band structures, our predicted GMB effect in CrI3 opens a new paradigm for spintronics applications. [1]

    [1] P. Jiang, L. Li, Z. Liao, Y. Zhao, and Z. Zhong, Nano Letters 18(6),3844 (2018).

    Biography:
      Prof. Zhicheng Zhong obtained his Bachelor degree from Shanghai jiaotong University, Master degree from Peking University, and Ph.D degree from Twente University in 2011. Then, he was a postdoc in Prof. Karsten Held’s group of Vienna University of Technology, and Humboldt postdoc research fellow in Wuerzburg University, and Max Planck postdoc research fellow in Max Planck institute of solid state physics. He was awarded national 1000 young talent, 100 talent of Chinese Academy of Sciences, and joined Ningbo Institute of Materials Technology and Engineering in 2017. His research is focused on complex oxide interfaces and two dimensional magnetic materials.

    Organizer: Hefei National Laboratory for Physical Sciences at the Microscale
       

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