Two-dimensional semiconductor transition metal dichalcogenides: basic properties

Abstract The purpose of this chapter is to introduce transition metal dichalcogenides (TMDCs). Starting with the lattice structure, we explore the consequences of the material symmetries by drawing on similarities between these materials and graphene. We then proceed to the band structure and its dependence on the material thickness. Again, using graphene as a familiar example, we highlight the differences between TMDC and graphene bands. On the basis of this, we provide a generic Hamiltonian that describes TMDCs. From this, we move to the spin–orbit coupling and discuss its consequences for these materials (e.g., valley selection, spin lifetime). Finally, we address excitonic and plasmonic effects. Where applicable, we provide a connection between theory and experiments to give a more complete picture.