Electron Transport in MoWSeS Monolayers in Presence of an External Electric Field

Abstract

The influence of an external electric field on single-layer transition-metal dichalcogenides TX2 with T = Mo, W and X = S, Se (MoWSeS) have been investigated by means of density-functional theory within two-dimensional periodic boundary conditions under consideration of relativistic effects including the spin-orbit interactions. Our results show that the external field modifies the band structure of the monolayers, in particular the conduction band. This modification has, however, very little influence on the band gap and effective masses of holes and electrons at the K point, and also the spin-orbit splitting of these monolayers is almost unaffected. Our results indicate a remarkable stability of the electronic properties of TX2 monolayers with respect to gate voltages. A reduction of the electronic band gap is observed only starting from field strengths of 2.0 V per Å (3.5 V per Å) for selenides (sulphides), and the transition to a metallic phase would occur at fields of 4.5 V per Å (6.5 V per Å).

submitted to PRB rapid communication, 9 pages, 4 figures, 2 tables

References in corpus (3)

• Small-signal amplifier based on single-layer MoS2
• Electric Field Effects on Armchair MoS2 Nanoribbons
• Electromechanics in MoS2 and WS2: nanotubes vs. monolayers

Cited by in corpus (9)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Shubnikov-de Haas oscillations of high mobility holes in monolayer and bilayer WSe${}_2$: Landau level degeneracy, effective mass, and negative compressibility
• Transition-metal dichalcogenide bilayers: switching materials for spin- and valleytronic applications
• Ambipolar Landau levels and strong band-selective carrier interactions in monolayer WSe${}_2$
• Metal-insulator transition in transition metal dichalcogenide heterobilayer moiré superlattices
• GW band structure of monolayer MoS2 using the SternheimerGW method and effect of dielectric environment
• Field effect in stacked van der Waals heterostructures: Stacking sequence matters
• Hole spin relaxation in bilayer WSe${}_2$
• Two dimensional crystals in three dimensions: electronic decoupling of single-layered platelets in colloidal nanoparticles