Highly Efficient (Cs$_{8}$V) Superatom based Spin-polarizer

Quantum transport through molecules and the possibility to manipulate spin has generated tremendous excitement. Here, we demonstrate unusual spin transport through a molecule of two Cs$_{8}$V magnetic superatoms. Calculations based on density functional theory and non-equilibrium Green's function methods find a much higher current for the spin-down charge carriers relative to the spin-up carriers in the model Au-(Cs$_{8}$V)-(Cs$_{8}$V)-Au device system with almost 100{\%} spin polarization, indicating a highly efficient spin polarizer. The new behavior is rooted in strong coupling of the localized magnetic core on V and the itinerant electrons of the Cs shell atoms leading to nearly full spin-polarization.