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(a) Structure of a hexagonal TMD monolayer. M atoms are in black and X atoms are in yellow. (b) A hexagonal TMD monolayer seen from above. Transition-metal dichalcogenide (TMD or TMDC) monolayers are atomically thin semiconductors of the type MX 2, with M a transition-metal atom (Mo, W, etc.) and X a chalcogen atom (S, Se, or Te).
MoS 2, the most common metal dichalcogenide, adopts a layered structure. Metal dichalcogenides have the formula ME 2, where M = a transition metal and E = S, Se, Te. [7] The most important members are the sulfides. They are always dark diamagnetic solids, insoluble in all solvents, and exhibit semiconducting properties. Some are superconductors ...
These effects also represent nonlinear phenomena of generation of electric current in two-dimensional materials, such as transition metal dichalcogenide monolayers or graphene, located on a piezoelectric substrate by a propagating acoustic wave. The generated electric currents are proportional to the intensity of the acoustic wave and their ...
Platinum diselenide is a transition metal dichalcogenide with the formula PtSe 2. It is a layered substance that can be split into layers down to three atoms thick. PtSe 2 can behave as a metalloid or as a semiconductor depending on the thickness.
NbSe 2 crystallizes in several related forms, and can be mechanically exfoliated into monatomic layers, similar to other transition metal dichalcogenide monolayers. Monolayer NbSe 2 exhibits very different properties from the bulk material, such as of Ising superconductivity, quantum metallic state, and strong enhancement of the CDW. [3]
Monolayers of a transition metal dichalcogenide (TMD) are a good and cutting-edge example where excitons play a major role. In particular, in these systems, they exhibit a bounding energy of the order of 0.5 eV [3] with a Coulomb attraction between the hole and the electrons stronger than in other traditional quantum wells. As a result, optical ...
As in graphene, the layered structures of MoS 2 and other transition metal dichalcogenides exhibit electronic and optical properties [48] that can differ from those in bulk. [49] Bulk MoS 2 has an indirect band gap of 1.2 eV, [50] [51] while MoS 2 monolayers have a direct 1.8 eV electronic bandgap, [52] supporting switchable transistors [53 ...
The low-energy properties some semiconducting transition metal dichalcogenide monolayers, can be described by a two-dimensional massive (gapped) Dirac Hamiltonian with an additional term describing a strong spin–orbit coupling: [19] [20] [21] [22]