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We present a theoretical study, based on density functional theory and tightbinding modeling, of the electronic structure and spin transport properties ofsilicon nanoparticles with adsorbed bismuth atoms. We find the bismuth atoms toform clusters separated by quantum tunnel barriers. We predict strong spinfiltering by these nanostructures in the high conductance regime when thesource and drain leads are connected to the same bismuth cluster and in the lowconductance regime when the source and drain leads are connected to differentbismuth clusters. We relate the spin filtering to a symmetry obeyed by the spintransmission probability matrix of the system. We also predict that for suchsystems the direction of the spin polarization in the drain lead can be tunedthrough large angles and even reversed electrostatically simply by varying thevoltage applied to a gate. Realization of these silicon-bismuth nanostructuresin the laboratory is feasible. We expect the predicted spin filtering to beexperimentally accessible and potentially relevant for device applications.

physical review. b./physical review. b

Strong Spin Filtering by Silicon Nanoparticles with Adsorbed Bismuth  Atom Clusters: Role of Symmetry and Electrostatic Control of the Direction of  the Spin Polarization