Optical vorticity from nontrivial Chern numbers enhances electron-impurity skew scattering in topological materials, yielding a ballistic photovoltaic current whose frequency scaling and tensor constraints depend on topological class, defect symmetry, and polarization.
Effective lattice Hamiltonian for monolayer MoS2 : Tailoring electronic structure with perpendicular electric and magnetic fields
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abstract
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 quasi-degenerate 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. Besides, we also show that applying a gate voltage perpendicular to the monolayer modifies the electronic structure including the band gap and effective masses.
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Vortex-enhanced photovoltaic current in disordered topological materials
Optical vorticity from nontrivial Chern numbers enhances electron-impurity skew scattering in topological materials, yielding a ballistic photovoltaic current whose frequency scaling and tensor constraints depend on topological class, defect symmetry, and polarization.