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Spin-Dependent Quantum Interference in Nonlocal Graphene Spin Valves
journal contribution
posted on 2014-05-14, 00:00 authored by M. H. D. Guimarães, P. J. Zomer, I. J. Vera-Marun, B. J. van WeesUp
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.
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nonlocal measurementsresults showgraphene nanostructuretransport experimentsgate voltage2 ordersfuture spintronic devicesquantum transport propertiesconstrictiongraphene nanostructuresnonlocal voltageNonlocal Graphene Spin ValvesUpcarrier densitycontributionphase coherenceside gate electrodesemiclassical regimesignalchanges polarity
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