Abstract
Graphene is expected to possess characteristics that are particularly useful for transporting and manipulating electronic spin. The discovery of spin-dependent interference features in its electrical characteristics could be useful in the development of graphene spintronics. The unusual electronic properties of single-layer graphene1 make it a promising materials system for fundamental advances in physics, and an attractive platform for new device technologies. Graphene’s spin-transport properties are expected to be particularly interesting, with predictions for extremely long coherence times and intrinsic spin-polarized states at zero field2,3,4,5. To test such predictions, it is necessary to measure the spin polarization of electrical currents in graphene. Here, we resolve spin transport directly from conductance features that are caused by quantum interference. These features split visibly in an in-plane magnetic field, similar to Zeeman splitting in atomic and quantum-dot systems6,7. The spin-polarized conductance features that are the subject of this work may, in the future, lead to the development of graphene devices incorporating interference-based spin filters.
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