Controllable spin filtering and half metallicity in -borophene nanoribbons
arXiv:2110.07036 · doi:10.1103/PhysRevB.104.245431
Abstract
The experimental observation of the Dirac fermion states in -borophene sheets and the discovery of their novel topological properties properties have made them a promising candidate for spintronic applications. Here, by combining non-equilibrium Green's function (NEGF) and tight-binding (TB) approximation, we study the charge and spin transport properties through a -borophene nanoribbon (BNR) with the different edge shapes. We show when a BNR exposed to a nonlocal exchange magnetic field, the spin filtering occurs for both spin-up and spin-down 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 indicates a half-metallic nature which is electrically controllable. Moreover, the influence of local exchange field fields is evaluated by exposing the edges of ABNR to ferromagnetic strips with parallel and antiparallel configurations. Our findings show that the edge manipulations in ABNRs lead to the emergence of a giant magnetoresistance and a perfect spin filter. Finally, we studied 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.
arXiv comment10 pages, 10 figures
References in corpus (23)
- Half-Metallic Graphene Nanoribbons
- Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
- MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
- Experimental Realization of Two-Dimensional Boron Sheets
- Evidence of silicene in honeycomb structures of silicon on Ag(111)
- Emergence of magnetism in graphene materials and nanostructures
- Novel Precursors for Boron Nanotubes: The Competition of Two-Center and Three-Center Bonding in Boron Sheets
- Dirac fermions in borophene
- Review of borophene and its potential applications
- Quantum conductance of graphene nanoribbons with edge defects
- Discovery of two-dimensional Dirac nodal line fermions in monolayer Cu2Si
- Towards Three-Dimensional Weyl-SurfaceSemimetals in Graphene Networks
- Synthesis of Borophene Nanoribbons on Ag(110) Surface
- Edge Effects in Finite Elongated Graphene Nanoribbons
- Tailoring magnetic insulator proximity effects in graphene: First-principles calculations
- Stability, Electronic and Magnetic properties of magnetically doped topological insulators Bi2Se3, Bi2Te3 and Sb2Te3
- Three-dimensional Pentagon Carbon with a genesis of emergent fermions
- Triplet Fermions and Dirac Fermions in Borophene
- Electronic and Magnetic Properties of Pristine and Hydrogenated Borophene Nanoribbons
- Quantum blockade and loop current induced by a single lattice defect in graphene nanoribbons
- Tunable spin-polarized edge currents in proximitized transition metal dichalcogenides
- Negative differential resistance and magnetoresistance in zigzag borophene nanoribbons
- An improved Green's function algorithm applied to quantum transport in carbon nanotubes