Magneto-Spin?Orbit Graphene: Interplay between Exchange and Spin?Orbit Couplings
Sprache des Titels:
Englisch
Original Kurzfassung:
A rich class of spintronics-relevant phenomena
require implementation of robust magnetism and/or strong
spin?orbit coupling (SOC) to graphene, but both properties
are completely alien to it. Here, we for the first time
experimentally demonstrate that a quasi-freestanding character,
strong exchange splitting and giant SOC are perfectly
achievable in graphene at once. Using angle- and spin-resolved
photoemission spectroscopy, we show that the Dirac state in
the Au-intercalated graphene on Co(0001) experiences giant
splitting (up to 0.2 eV) while being by no means distorted due
to interaction with the substrate. Our calculations, based on
the density functional theory, reveal the splitting to stem from
the combined action of the Co thin film in-plane exchange
field and Au-induced Rashba SOC. Scanning tunneling microscopy data suggest that the peculiar reconstruction of the
Au/Co(0001) interface is responsible for the exchange field transfer to graphene. The realization of this ?magneto-spin?orbit?
version of graphene opens new frontiers for both applied and fundamental studies using its unusual electronic bandstructure.