Supplemental Materials for Ultra-flat Bands at large twist angles in Group-V Twisted Bilayer Materials

lThe supplementary material includes the construction method of the twisted bilayers structures, the comparison of calculation time between DeepH and OpenMX, and the loss functions of the three models. In addition, the results show the energy band structures of twisted β-P and β-Sb with different twist angles. Finally, we have included the data on twisted β-Bi to provide a more complete investigation of Group-V moirés material.