Quantum magnetotransport in a bilayer MoS2: influence of a perpendicular electric field
arXiv:1808.09421 · doi:10.1103/PhysRevB.96.045405
Abstract
We first derive the energy dispersion of bilayer MoS in the presence of a perpendicular electric field . We show that the band gap and layer splitting can be controlled by the field . Away from the point, the intrinsic SOC splitting increases in the conduction band but is weakly affected in the valence band. We then analyze the band structure in the presence of a perpendicular magnetic field and the field , including spin and valley Zeeman terms, and evaluate the Hall and longitudinal conductivities. We discuss the numerical results as functions of the fields and for finite temperatures. The field gives rise to a significant spin splitting in the conduction band, to a beating in the Shubnikov-de Haas (SdH) oscillations when it's weak, and to their splitting when it's strong. The Zeeman terms and suppress the beating and change the positions of the beating nodes of the SdH oscillations at low fields and enhance their splitting at high fields. Similar beating patterns are observed in the spin and valley polarizations at low fields. Interestingly, a spin polarization and a square-wave-shaped valley polarization are observed at high fields. The Hall-plateau sequence depends on . These findings may be pertinent to future spintronic and valleytronic devices.
arXiv comment14 figures 25 pages
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