Fig. 8: Equilibrium geometry of the 2.2° twist-angle GeSn bilayer.
From: Covalent bonded bilayers from germanene and stanene with topological giant capacitance effects
a Top view of the unitary cell containing 182 atoms. The lattice strain is 0.09%. All atoms experience lattice distortions both in the xy-plane and in the z direction. b Side view showing significant lattice distortions in the vertical z direction. The thickness of this type of bilayer is around 6 Å, same as for the 30° twist-angle cell.
