Stacking order and driving forces in the layered charge density wave phase of 1T-MX2 (M = Nb, Ta and X = S, Se)
The group-V transition metal dichalcogenides (TMD) have attracted a lot of research due to their unique structures and rich physical properties.In these materials, charge density waves (CDW) are still the subject worthy of in-depth research despite being a popular issue.Based on first principles, the stacking effect of the T- MX _2 (M = Nb, Ta and