Effective Hamiltonian of monolayer MoS_2 and its intrinsic optical conductivity

by Habib Rostami (Institute for Research in Fundamental Science (IPM), Tehran)

Thursday 20 Mar 2014, 16:00 → 18:00 Europe/Rome

Aula Conversi (Dipartimento di Fisica - Ed. G.Marconi)

Monolayer molybdenum disulfide, MoS_2, is a prototypical transition-metal dichalcogenide semiconductor. It has attracted the attention of several research groups because its general properties,such as mechanical stability and flexibility, direct energy band gap, strong spin orbit splitting, valley degree of freedom and massive Dirac-like electronic structure, are promising in electronic and optoelectronic devices. In this talk, I am going to present an effective tight binding Hamiltonian of monolayer MoS_2 to capture its main low energy physics. Then I will briefly compare different existing model Hamiltonians which are describing this electronic system. Finally, I will go through the similarity between the model Hamiltonian of monolayer MoS_2 and topological insulator where I will particularly discuss on the low-energy band structure topology and the intrinsic optical conductivity of both electronic systems