“School of Physic”
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| Paper IPM / Physic / 12719 |
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We propose an effective lattice Hamiltonian for monolayer MoS2 in order to describe the lowenergy band structure and investigate the effect of perpendicular electric and magnetic fields on its electronic structure. We, first, derive a tight-binding model based on the hybridization of d orbitals of Molybdenum and p orbitals of Sulfur atoms and then, introduce a modified two-band model of monolayer MoS2 by exploiting the quasi-degenerate partitioning method. Our theory reveals a difference in electron and hole masses
and provides trigonal warping effects. Furthermore, we predict a valley degeneracy breaking effect in Landau levels. Besides, we also show that application of a gate field perpendicular to the monolayer, breaks the vertical mirror symmetry and induces different potentials in the three sublayers, can slightly modify the electronic structure including the band gap and effective masses.
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