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Paper   IPM / Nano-Sciences / 16899
School of Nano Science
  Title:   Controllable spin filtering and halfmetallicity in beta 12-borophene nanoribbons
1.  Fahimeh Norouzi
2.  Mohsen Farokhnezhad
3.  Mahdi Esmaeilzadeh
4.  Bartlomiej Szafran
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  104
  Year:  2021
  Pages:   245431
  Publisher(s):   American Physical Society
  Supported by:  IPM
The experimental observation of the Dirac fermion states in beta12-borophene sheets and the discovery of their novel topological properties have made them a promising candidate for spintronic applications. Here, by combining the nonequilibrium Greens function (NEGF) and tight-binding (TB) approximations, we study the charge and spin transport properties through a beta 12-borophene nanoribbon (BNR) with different edge shapes. We show that for BNR exposed to a nonlocal exchange magnetic field, the spin filtering occurs so that the spin direction of transmitted electrons could be controlled by adjusting the energy of incoming electrons with the help of an external backgate voltage. It is found that an armchair BNR (ABNR) in the simultaneous presence of a transverse electric field and a nonlocal exchange field acquires half-metallic properties. The influence of local exchange fields is evaluated by exposing the edges of BNRs to ferromagnetic strips with parallel and antiparallel configurations. Our findings show that the edge manipulations in BNRs lead to the emergence of giant magnetoresistance and a perfect spin filter. Finally, we study the effects of edge vacancies and Anderson disorder on the spin-dependent conductance of an ABNR and find that the perfect spin polarization is not destroyed in the presence of Anderson disorder and various single vacancies. Our results reveal the outstanding spin transport properties of ABNRs for future spintronic devices.

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