Effective lattice Hamiltonian for monolayer MoS 2 : Tailoring electronic structure with perpendicular electric and magnetic fields
By H. Rostami, Ali G. Moghaddam, R. Asgari. 2013
163 citations recorded by the source corpus.
We propose an effective lattice Hamiltonian for monolayer MoS${}_{2}$ in order to describe the low-energy band structure and investigate the effect of perpendicular electric and magnetic fields on its electronic structure. We derive a tight-binding model based on the hybridization of the $d$ orbitals of molybdenum and $p$ orbitals of sulfur atoms and then introduce a modified two-band continuum model of monolayer MoS${}_{2}$ by exploiting the quasidegenerate partitioning method. Our theory proves that the low-energy excitations of the system are no longer massive Dirac fermions. It reveals a difference between electron and hole masses and provides trigonal warping effects. Furthermore, we predict a valley-degeneracy-breaking effect in the Landau levels. In addition, we also show that applying a gate voltage perpendicular to the monolayer modifies the electronic structure, including the band gap and effective masses.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/07120103e923c232806084e62e81cbfe6f3a0af8
How researchers see this paper
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In Materials Chemistry
- Hector Ochoa
- I. Vera-Marun
- B. Özyilmaz
- Qing Zhang
- R. Ganatra
- Francisco Guinea
- N. M. R. Peres
- K. Novoselov
Citations in the corpus
- Few-layer MoS2: a promising layered semiconductor. (2014, methodology): “A vertical electric field exerted to few-layer MoS2 is found to be an efficient method for band gap engineering.(89,102) The band gap of bilayer MoS2 could be tuned to zero with an electric field of about 1.”
- Colloquium : Spintronics in graphene and other two-dimensional materials (2019, background): “The large crystal fields associated with the different atomic species prevent accidental degeneracies, so the bands remain gapped with approximately quadratic dispersion (Ordejón and Guinea, 2013; Rostami et al., 2013).”