Spin and angular resolved photoemission experiments on epitaxial graphene
| Autor: | Gierz, Isabella, Dil, Jan Hugo, Meier, Fabian, Slomski, Bartosz, Osterwalder, Juerg, Henk, Juergen, Winkler, Roland, Ast, Christian R., Kern, Klaus |
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| Rok vydání: | 2010 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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]. Comment: 5 pages, 2 figures |
| Databáze: | arXiv |
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