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Paper   IPM / Physic / 13695
School of Physics
  Title:   Valley Zeeman effect and spin-valley polarized conductance in MoS2 in a perpendicular magnetic field
  Author(s): 
1.  H. Rostami
2.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  91
  Year:  2015
  Pages:   075433
  Supported by:  IPM
  Abstract:
We study the effect of a perpendicular magnetic field of the electronic structure and charge transport of a monolayer MoS2 nanoribbon at zero temperature. We particularly explore the induced valley Zeeman (VZ) effect through the coupling between the magnetic field and the orbital magnetic moment. We show that the effective two-band Hamiltonian provides a mismatch between the VZ coupling in the conduction and valence bands due to effective mass asymmetry and it is proportional to B2 equally the diamagnetic shift of exciton binding energies. However, the dominant magnetic field which evolves with B linearly, originates from the multi-orbital and multi-band structures of the system. Besides, we investigate the transport properties by calculating the spin valley resolved conductance and show that, in a low-hole doped case, the transport edge channel of one spin component is chiral. This leads to a localization of the non-chiral spin component in the presence of disorder and thus provides a spin-valley polarized transport induced by disorder.

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