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Paper   IPM / Nano-Sciences / 14775
School of Nano Science
  Title:   Enhanced spin-flip scattering by surface roughness in WS2 and MoS2 armchair nanoribbons
1.  Shoeib Babaee Touski
2.  Rafael Roldán
3.  Mahdi Pourfath
4.  M. Pilar Lopez-Sancho
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  95
  Year:  2017
  Pages:   165301
  Publisher(s):   American Physical Society
  Supported by:  IPM
The band structures of single-layer MoS2 and WS2 present a coupling between spin and valley degrees of freedom that suppresses spin-flip scattering and spin dephasing. Here we show that out-of-plane deformations, such as corrugations or ripples, enhance spin-flip scattering in armchair MoS2 and WS2 nanoribbons. Spin transport in the presence of surface roughness is systematically investigated, employing the nonequilibrium Green's function method along with the tight-binding approximation. Both transmission and conductance have been calculated as a function of surface roughness. Our results indicate that the spin-flip rate, usually neglected in flat pristine samples, increases significantly with the surface roughness amplitude. These results are important for the design and fabrication of transition metal dichalcogenides based spintronic devices.

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