期刊
NANOSCALE
卷 6, 期 7, 页码 3824-3829出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr04178f
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资金
- National Research Foundation of Korea(NRF)
- Korea government(MSIP) [2008-0062606]
- Ministry of Science, ICT and Future Planning [NRF-2013R1A1A2005598]
- Steel Science Program
- POSCO [4.0004556.01]
- National Honor Scientist Program [2010-0020414]
- WCU
- CCH by the SRC Center for Topological Matter [2011-0030787]
- POSTECH Basic Science Research Institute [4.0008000.01]
Intercalation of magnetic iron atoms through graphene formed on the SiC(0001) surface is found to induce significant changes in the electronic properties of graphene due mainly to the Fe-induced asymmetries in charge as well as spin distribution. From our synchrotron-based photoelectron spectroscopy data together with ab initio calculations, we observe that the Fe-induced charge asymmetry results in the formation of a quasi-free-standing bilayer graphene while the spin asymmetry drives multiple spin-split bands. We find that Fe adatoms are best intercalated upon annealing at 600 degrees C, exhibiting split linear p-bands, characteristic of a bilayer graphene, but much diffused. Subsequent changes in the C 1s, Si 2p, and Fe 3p core levels are consistently described in terms of Fe-intercalation. Our calculations together with a spin-dependent tight binding model ascribe the diffuse nature of the pi-bands to the multiple spin-split bands originated from the spin-injected carbon atoms residing only in the lower graphene layer.
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