• Corpus ID: 118669034

Spin and angular resolved photoemission experiments on epitaxial graphene

@article{Gierz2010SpinAA,
  title={Spin and angular resolved photoemission experiments on epitaxial graphene},
  author={Isabella Gierz and J. Hugo Dil and Fabian Meier and Bartosz Slomski and Juerg Osterwalder and J Henk and Roland G. Winkler and Christian R. Ast and Klaus Kern},
  journal={arXiv: Materials Science},
  year={2010}
}

• I. Gierz, J. Dil, +6 authors K. Kern
• Published 9 April 2010
• Physics
• arXiv: Materials Science

Our recently reported spin and angular resolved photoemission (SARPES) results on an epitaxial graphene monolayer on SiC(0001) suggested the presence of a large Rashba-type spin splitting of \Delta k=(0.030+-0.005)1/A [1]. Although this value was orders of magnitude larger than predicted theoretically, it could be reconciled with the line width found in conventional spin-integrated high resolution angular resolved photoemission spectroscopy (ARPES) data. Here we present novel measurements for a hydrogen intercalated quasi free-standing graphene monolayer on SiC(0001) that reveal a spin polarization signal that - when interpreted in terms of the Rashba-Bychkov effect [2,3] - corresponds to a spin splitting of \Delta k=(0.024+-0.005)1/A. This splitting is significantly larger than the half width at half maximum of spin-integrated high resolution ARPES measurements which is a strong indication that the measured polarization signal does not originate from a Rashba-type spin splitting of the graphene pi-bands as we suggested in our previous report [1].