%0 Journal Article %A H. D. Guimaràƒes, M. %A Zomer, P. J. %A Vera-Marun, I. J. %A J. van Wees, B. %D 2014 %T Spin-Dependent Quantum Interference in Nonlocal Graphene Spin Valves %U https://acs.figshare.com/articles/journal_contribution/Spin_Dependent_Quantum_Interference_in_Nonlocal_Graphene_Spin_Valves/2297401 %R 10.1021/nl501087r.s001 %2 https://acs.figshare.com/ndownloader/files/3934927 %K nonlocal measurements %K results show %K graphene nanostructure %K transport experiments %K gate voltage %K 2 orders %K future spintronic devices %K quantum transport properties %K constriction %K graphene nanostructures %K nonlocal voltage %K Nonlocal Graphene Spin ValvesUp %K carrier density %K contribution %K phase coherence %K side gate electrode %K semiclassical regime %K signal %K changes polarity %X Up to date, all spin transport experiments on graphene were done in a semiclassical regime, disregarding quantum transport properties such as phase coherence and interference. Here we show that in a quantum coherent graphene nanostructure the nonlocal voltage is strongly modulated. Using nonlocal measurements, we separate the signal in spin-dependent and spin-independent contributions. We show that the spin-dependent contribution is about 2 orders of magnitude larger than the spin-independent one, when corrected for the finite polarization of the electrodes. The nonlocal spin signal is not only strongly modulated but also changes polarity as a function of the applied gate voltage. By locally tuning the carrier density in the constriction via a side gate electrode we show that the constriction plays a major role in this effect. Our results show the potential of quantum coherent graphene nanostructures for the use in future spintronic devices. %I ACS Publications