Charge neutrality of quasi-free-standing monolayer graphene induced by the intercalated Sn layer
作者： Hidong Kim , Otgonbayar Dugerjav , Altaibaatar Lkhagvasuren , Jae M Seo
DOI: 10.1088/0022-3727/49/13/135307
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摘要: It has been confirmed by angle-resolved photoemission spectroscopy that decoupled quasi-free-standing monolayer graphene (QFMLG), obtained Sn intercalation between the buffer layer and 6H-SiC(0 0 1) substrate, is charge-neutral, i.e. Dirac point matches with Fermi level. By combined studies of scanning tunneling microscopy/spectroscopy core-level/valence-band on this system, it found intercalated atoms, bonding Si atoms top Si-C bilayer substrate comprise a hexagonal layer, which turns out to be metallic. Such metallic character, never in using different elements, major cause charge neutrality QFMLG, since conduction electrons compensate completely spontaneous polarization charges 1). This charge-neutral QFMLG stable at high temperature 850 ?C.
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