Perfect valley polarization in MoS2

  • Amin Heshmati-Moulai
  • Hamidreza Simchi
  • Mahdi Esmaeilzadeh
Regular Article
  • 91 Downloads

Abstract

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.

Keywords

Mesoscopic and Nanoscale Systems 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Amin Heshmati-Moulai
    • 1
  • Hamidreza Simchi
    • 1
    • 2
  • Mahdi Esmaeilzadeh
    • 1
  1. 1.Department of PhysicsIran University of Science and TechnologyTehranIran
  2. 2.Semiconductor Technology Center, 19575-199 TehranIran

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