Extended Data Fig. 3: Classification of possible CDW configurations in EuTe4.
From: Large moiré superstructure of stacked incommensurate charge density waves
The CDW configurations in EuTe4 can be classified by the respective out-of-plane period or wavevector of monolayer and bilayer CDWs. The phase (0 or π) of CDW in each layer of Te sheet is represented by an arrow (up or down). According to the experimental observation, the ground state features 1c periodicity for monolayer (q1,c = c*) and 2c periodicity for bilayer (q2,c = 0.5 c*). All configurations satisfying the out-of-plane wavevector condition are grouped into ground state G. Each column in the group represents a different configuration differentiated by the relative phase between the monolayer and bilayer. All other ground-state configurations indistinguishable in diffraction measurement are equivalent to one of these two columns in terms the out-of-plane period and relative phases between layers. Similarly, M1, M2, and M3 correspond to metastable states classified by different out-of-plane periodicity respectively.
