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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport

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Spin-induced band modifications of graphene through intercalation of magnetic iron atoms

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Title
Spin-induced band modifications of graphene through intercalation of magnetic iron atoms
Author
Sung, S. J.Yang, J. W.Lee, P. R.Kim, J. G.Ryu, M. T.Park, H. M.Lee, GeunsikHwang, C. C.Kim, Kwang S.Kim, J. S.Chung, J. W.
Keywords
EPITAXIAL GRAPHENE; FILMS
Issue Date
201404
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.6, no.7, pp.3824 - 3829
Abstract
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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DOI
http://dx.doi.org/10.1039/c3nr04178f
ISSN
2040-3364
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