2010/04/09 by Isabella Gierz, Gierz, Isabella, J. Hugo Dil +16
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Materials Science (cond-mat.mtrl-sci) #Quantum and electron transport phenomena #Semiconductor materials and devices #Surface and Thin Film Phenomena
paper · pdf · doi:10.48550/arxiv.1004.1573
openalex publication_date 2010/04/09 · openalex created_date 2022/08/30 · openalex updated_date 2026/07/28
Our recently reported spin and angular resolved photoemission (SARPES)\nresults on an epitaxial graphene monolayer on SiC(0001) suggested the presence\nof a large Rashba-type spin splitting of \Δ k=(0.030+-0.005)1/A [1].\nAlthough this value was orders of magnitude larger than predicted\ntheoretically, it could be reconciled with the line width found in conventional\nspin-integrated high resolution angular resolved photoemission spectroscopy\n(ARPES) data. Here we present novel measurements for a hydrogen intercalated\nquasi free-standing graphene monolayer on SiC(0001) that reveal a spin\npolarization signal that - when interpreted in terms of the Rashba-Bychkov\neffect [2,3] - corresponds to a spin splitting of \Δ k=(0.024+-0.005)1/A.\nThis splitting is significantly larger than the half width at half maximum of\nspin-integrated high resolution ARPES measurements which is a strong indication\nthat the measured polarization signal does not originate from a Rashba-type\nspin splitting of the graphene pi-bands as we suggested in our previous report\n[1].\n