Exchange interaction of magnetic impurities in biased bilayer phosphorene nanoribbon
arXiv:1808.02930 · doi:10.1103/PhysRevB.98.205401
Abstract
We study exchange interaction in zigzag bilayer phosphorene nanoribbons (ZBLPNRs) under a perpendicular electric field. We evaluate the spatial and electric field dependency of static spin susceptibility in real space in various configurations of magnetic impurities at zero temperature. The electronic properties of ZBLPNR in the presence of a gate voltage is also obtained. In comparison to the other two-dimensional (2D) materials such as graphene and silicene, ZBLPNR has two nearly degenerated quasiflat edge modes at the Fermi level, isolated from the bulk states. The band gap modulation of ZBLPNRs by the ribbon width and perpendicular electric field is investigated. Due to the existence of these quasiflat bands at the Fermi level, in the absence of the electric field, a sharp peak in the RKKY interaction is seen. As shown, the signatures of these quasiflat edge modes in ZBLPNRs could be explored by using the RKKY interaction. In the presence of a large bias potential, a beating pattern of the RKKY oscillations occurs when two impurities located inside the ZBLPNR. The electrically tunable RKKY coupling of ZBLPNRs is expected to have important consequences on the spintronic application of biased ZBLPNR.
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