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Unintentional doping induced splitting of G peak in bilayer graphene
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Optical microscope image of graphene, the red curve denotes the area of BLG. (b) Atomic force microscope image of the edge of BLG; the inset shows the height profile across the edge of BLG.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Typical Raman spectrum of the BLG shown in Fig. 1; the inset shows the Raman spectrum of a monolayer graphene. (b) The splitting of G peak into S peak and AS peak: the top-blue curve was recorded through a 50× objective lens and the below-red curve was recorded through a 20× objective lens; the inset shows the relative shift of S peak and AS peak (Δw) measured on 37 locations of the BLG; 31 out of 37 (84%, indicated by the rectangular area) fall in the area of 14.6±1.5 cm−1.

Image of FIG. 3.
FIG. 3.

(Color online) The deconvolution of a typical 2D peak. The 2D peak can be fitted by three Gaussian peaks, corresponding to 2D1B, 2D1A, 2D2A, respectively.

Image of FIG. 4.
FIG. 4.

(Color online) (a) The band structure of intrinsic BLG near the K point. (b) The band structure of unintentional doped BLG, where EF(Fermi level) locates ∼0.25 eV above the K point. The band gap opening is not considered in this diagram. The wave factors corresponding to the 2D1A, 2D1B, 2D2A, and 2D2B transitions are shown as arrows in (a) and (b). The 2D2B cannot be resolved in the 2D peak in the doped BLG may be screened by heavy electron doping.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unintentional doping induced splitting of G peak in bilayer graphene