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Linear scaling between momentum and spin scattering in graphene

Jozsa, C., Maassen, T., Popinciuc, M., Zomer, P. J., Veligura, A., Jonkman, H. T. & van Wees, B. J., Dec-2009, In : Physical Review. B: Condensed Matter and Materials Physics. 80, 24, p. 241403-1-241403-4 4 p., 241403.

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DOI

Spin transport in graphene carries the potential of a long spin-diffusion length at room temperature. However, extrinsic relaxation processes limit the current experimental values to 1-2 mu m. We present Hanle spin precession measurements in gated lateral spin valve devices in the low to high (up to 10(13) cm(-2)) carrier density range of graphene. A linear scaling between the spin-diffusion length and the diffusion coefficient is observed. We measure nearly identical spin- and charge diffusion coefficients indicating that electron-electron interactions are relatively weak and transport is limited by impurity potential scattering. When extrapolated to the maximum carrier mobilities of 2x10(5) cm(2)/Vs, our results predict that a considerable increase in the spin-diffusion length should be possible.

Original languageEnglish
Article number241403
Pages (from-to)241403-1-241403-4
Number of pages4
JournalPhysical Review. B: Condensed Matter and Materials Physics
Volume80
Issue number24
Publication statusPublished - Dec-2009

    Keywords

  • carrier density, carrier lifetime, carrier mobility, graphene, impurity scattering, spin dynamics, spin polarised transport, SUSPENDED GRAPHENE, PRECESSION, TRANSPORT

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