Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism

We introduce a universal methodology for generating and manipulating altermagnetism in two-dimensional (2D) magnetic Van der Waals (MvdW) materials through twisting. We find that a key in-plane twofold rotational operation can be achieved in a twisted bilayer of any 2D MvdW material, which takes one of all five 2D Bravais lattices, thereby inducing altermagnetism. By choosing the constituent MvdW monolayer with specific symmetry, our approach can tailor altermagnetism of any type, such as d wave, g wave, and i wave. Furthermore, the properties of our twisted altermagnetic materials can be easily engineered. Taking a transition-metal oxyhalide VOBr as an example, we find that by tuning the twist angle and Fermi…

• NN
  National Natural Science Foundation of China

  Award: 12374055
• SF
  Science Fund for Creative Research Groups

  Award: 12321004
• NK
  National Key Research and Development Program of China

  Award: 2020YFA0308800