2016/12/31 by A. Heshmati, Amin Heshmati-Moulai, Hamidreza Simchi +3 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #2D Materials and Applications #Asymmetry #Chemistry #Condensed matter physics #Electron #Geometry #Graphene research and applications #Magnetic field #Materials science #Monolayer #Nanotechnology #Physics #Polarization (electrochemistry) #Quantum mechanics #Spin polarization #Topological Materials and Phenomena #Zigzag #cond-mat.mes-hall
paper · pdf · doi:10.1140/epjb/e2017-70726-3
published in The European Physical Journal B 90(7) (Springer Science+Business Media)
openalex created_date 2017/01/06 · arxiv created 2017/05/05 · openalex publication_date 2017/07/01 · arxiv updated 2017/11/21 · openalex updated_date 2026/08/05
We study perfect valley polarization in a molybdenum disulfide MoS2 nanoribbon monolayer using two bands Hamiltonian model and non-equilibrium Green's function method. The device consists of a one-dimensional quantum wire of MoS2 monolayer sandwiched between two zigzag MoS2 nanoribbons such that the sites A and B of the honeycomb lattice are constructed by the molecular orbital of Mo atoms, only. Spin-valley coupling is seen in energy dispersion curve due to the inversion asymmetry and time-reversal symmetry. Although, the time reversal symmetry is broken by applying an external magnetic field, the valley polarization is very small. A valley polarization equal to 46% can be achieved using an exchange field of 0.13 eV. It is shown that a particular spin-valley combination with perfect valley polarization can be selected based on a given set of exchange field and gate voltage as input parameters. Therefore, the valley polarization can be detected by detecting the spin degree of freedom.