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Paper   IPM / Physic / 12719
School of Physics
  Title:   E ffective Lattice Hamiltonian for Monolayer MoS2 : Tailoring Electronic Structure with Perpendicular Electric and Magnetic Fields
  Author(s): 
1.  H. Rostami
2.  A. G. Moghaddam
3.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  88
  Year:  2013
  Pages:   085440
  Supported by:  IPM
  Abstract:
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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