Electronic Properties and Phase Transitions in Group-5 Transition Metal Ditellurides MTe2 (M = V, Nb, Ta)

The group-5 transition metal ditellurides MTe2 (M = V, Nb, Ta) exhibit complex superperiodic crystal structures and electronic band structures, including the formation of flat bands, quasi-one-dimensional Fermi surfaces, and nontrivial topological properties. These electronic properties are closely tied to the local molecular-like orbital bonding patterns in the materials.