One example of low-dimensional quantum materials is van der Waals heterostructures with a moiré potential that naturally forms with a specific twist angle between layers.
Figure 1. Moiré pattern formed by two WSe2 layers stacked with a twist angle ranging from 0° to 10°.
Figure 2. Close-up moiré pattern formed by two WSe2 layers stacked with a twist angle of 5°.