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Perfect valley polarization in MoS2

Author

Listed:
  • Amin Heshmati-Moulai

    (Iran University of Science and Technology)

  • Hamidreza Simchi

    (Iran University of Science and Technology
    Semiconductor Technology Center, 19575-199)

  • Mahdi Esmaeilzadeh

    (Iran University of Science and Technology)

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.

Suggested Citation

  • Amin Heshmati-Moulai & Hamidreza Simchi & Mahdi Esmaeilzadeh, 2017. "Perfect valley polarization in MoS2," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(7), pages 1-7, July.
    • Handle: RePEc:spr:eurphb:v:90:y:2017:i:7:d:10.1140_epjb_e2017-70726-3
    DOI: 10.1140/epjb/e2017-70726-3
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    Keywords

    Mesoscopic and Nanoscale Systems;

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