Moirre Superlattice

[sani abdulkareem]

Dear twister community,

I have been trying to generate a Moirre pattern in WSe2/WS2 heterostructure using this great package, however, I noticed a mismatch in atom count with the WS2 layer than WSe2. In most cases a difference of 2 or 3 atoms but under all twist angle, strain and range, the WS2 has more atoms than WSe2, yet Moirre can be visibly seen.  Also, in few scenarios different angles result in same number of atoms. This raised concern about the commensurability of the supercell and the role of the applied strain in minimizing the mismatch. 

Could you please kindly clarify if that is normal with the twister package, or explain why this happens. I want to be sure if this will not affect the properties of the heterostructure.

Thank you very much,

Kind regards,

Sani