量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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In spin-polarized surface positronium annihilation measurements, the spin polarizations of graphene and h-BN on Co(0001) were higher than those on Ni(111), while no significant differences were seen between graphene and h-BN on the same metal. The obtained spin polarizations agreed with those expected from first-principles calculations considering the positron wave function and the electron density of states from the first surface layer to the vacuum region. The higher spin polarizations of graphene and h-BN on Co(0001) as compared to Ni(111) simply reflect the spin polarizations of these metals. The comparable spin polarizations of graphene and h-BN on the same metal are attributed to the creation of similar electronic states due to the strong influence of the metals:
the Dirac cone of graphene and the band gap of h-BN disappear as a consequence of d-π hybridization.
Spin polarization of graphene and $h$-BN on Co(0001) and Ni(111) observed by spin-polarized surface positronium spectroscopy
