Extended Data Fig. 1: The lattice structures of M3X8 and M3QX7.
From: Near-100% spontaneous rolling up of polar van der Waals materials
a, Side-view structure model of the stacked M and X atomic layers in the M3X8 vdW lattice. The black dash frames label two different sizes of M-M atomic spacings. b, Breathing-kagome lattice structure consisting of M atoms in the top view of the M3X8 lattices. The green regions mark the two types of M-triangles in the breathing-kagome lattice consisting of different M-M spacings. c, Side-view structure model of the stacked M and X atomic layers in the M3QX7 vdW lattice. d, Breathing-kagome lattice structure consisting of M atoms in the top view of the M3QX7 lattices. The green regions mark the two types of M-triangles in the breathing-kagome lattice consisting of different M-M spacings.
