K. Pi, Wei Han, K. M. McCreary, A. G. Swartz, Yan Li, R. K. Kawakami
Published 2010-03-03Version 1
The effects of surface chemical doping on spin transport in graphene are investigated by performing non-local measurements in ultrahigh vacuum while depositing gold adsorbates. We demonstrate manipulation of the gate-dependent non-local spin signal as a function of gold coverage. We discover that charged impurity scattering is not the dominant mechanism for spin relaxation in graphene, despite its importance for momentum scattering. Finally, unexpected enhancements of the spin lifetime illustrate the complex nature of spin relaxation in graphene.
Comments: 11 Pages, 4 figures
Journal: Phys. Rev. Lett. 104, 187201 (2010)
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