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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Formation of Boron-Carbon Nanosheets and Bilayers in Boron-Doped Diamond: Origin of Metallicity and Superconductivity

Fig. 4

Vibrational and electronic Raman spectra of BDD. a Evolution of the Raman spectra of the (001) BDD plates with increasing boron concentration in backscattering along z||[001]. The incident light is polarized along x′||[110], and the scattered light is analyzed along y′||[1 \( \overline{1} \) 0]. The spectra were excited with the 514-nm laser line. b Evolution of the unpolarized Raman spectra of the same (001) BDD plates excited with the 257-nm laser line. c Evolution of the electronic Raman spectra of the same (001) BDD plates excited with the 514-nm laser line, recorded at 20 K in the backscattering geometry. The same colors in ac correspond to BDD plates with the same boron concentration. d Raman spectra of the as-grown and polished (001) and (111) surfaces of the BDD in different backscattering geometries excited with the 514-nm laser line. e The dependence of the resonant Raman spectra from the (111) surface of BDD on the boron concentration and on the modulation period from 43.25 Å (top) to 6.18 Å (bottom) with a step of 6.18 Å. f The phonon density of states F(ω) and the Eliashberg phonon spectral function α 2 F(ω) calculated for the ABCACA sequence shown in the inset

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