Varykhalov, A.; Sánchez-Barriga, J.; Shikin, A. M.; Biswas, C.; Vescovo, E.; Rader, O.: Electronic and magnetic properties of quasi-freestanding graphene on Ni. Physical Review Letters 101 (2008), p. 157601/1-4
10.1103/PhysRevLett.101.157601
Abstract:
For the purpose of recovering the intriguing electronic properties of freestanding graphene at a solid surface, graphene self-organized on a Au monolayer on Ni(111) is prepared and characterized by scanning tunneling microscopy. Angle-resolved photoemission reveals a gapless linear pi-band dispersion near (K) over bar as a fingerprint of strictly monolayer graphene and a Dirac crossing energy equal to the Fermi energy (E-F) within 25 meV meaning charge neutrality. Spin resolution shows a Rashba effect on the pi states with a large (similar to 13 meV) spin-orbit splitting up to E-F which is independent of k.