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Abstract
In graphene-based nano junctions, the edge-topology of graphene nanoribbons (GNRs) is crucial to modulate the spin-dependent transport through quantum interference (QI). Herein we have investigated the quantum transport properties of armchair GNRs (AGNRs) and zig-zag GNRs (ZGNRs) nanoribbons employing density functional theory in combination with nonequilibrium Green’s function (NEGF-DFT) techniques. The spin-polarized transmission spectra, with spin-filtering efficiency up to 50%, are observed for the ZGNRs in the low-lying ferromagnetic state. Such spin response in the transmission spectra remains silent for the non-magnetic AGNR and antiferromagnetic ZGNR in their respective ground states. Further, upon reducing the width of ZGNR, we observed that the evolved spin-dependent QI features leading to high spin-filtering efficiency.
Supplementary materials
Title
Supporting Information - Quantum Interference Controlled Spin-Polarized Electron Transmission in Graphene Nanoribbons
Description
Computed total energies and magnetic moment values, geometric and electronic structure of GNRs, spin density plots of GNR devices, sub-band wave-function at Fermi level, spin filtering efficiency plot.
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