1977
DOI: 10.1002/pssb.2220840226
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A Raman and far‐infrared investigation of phonons in the rhombohedral V2–VI3 compounds Bi2Te3, Bi2Se3, Sb2Te3 and Bi2(Te1−xSex)3 (0 < x < 1), (Bi1−ySby)2Te3 (0 < y < 1)

Abstract: The Raman-active lattice vibrations of Bi,Se,, Bi,Te,, Sb,Te,, and their solid solutions, whose symmetries correspond to tho R5m space group, are investigated by Raman scattering. Three of the four expected Raman modes, E, and AI,, could be determined. The F I R optical properties of Bi,Te, crystal surfaces of improved quality ( E I I c and E 1 c ) and Bi,Se, ( E _L c ) are re-examined near helium and room temperature with a Fourier spectrometer, allowing a determination of the infrared-active mode frequencies… Show more

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Cited by 543 publications
(330 citation statements)
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“…Other than the expected, and previously reported Raman-active bulk modes [19,20], we find weak peaks at low temperatures in both compounds, which we ascribe 2 | P a g e to surface vibrational modes. Density functional theory calculations, which do not consider spinorbit coupling, support such an assignment in that they reveal a pair of surface-modes, the lowerfrequency of which is very close in frequency with the peaks found in the Raman experiments.…”
Section: Introductionsupporting
confidence: 72%
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“…Other than the expected, and previously reported Raman-active bulk modes [19,20], we find weak peaks at low temperatures in both compounds, which we ascribe 2 | P a g e to surface vibrational modes. Density functional theory calculations, which do not consider spinorbit coupling, support such an assignment in that they reveal a pair of surface-modes, the lowerfrequency of which is very close in frequency with the peaks found in the Raman experiments.…”
Section: Introductionsupporting
confidence: 72%
“…These modes transform as 2 + 2 1 + 2 + 2 1 , where 2 + 2 1 and 2 + 2 1 are, respectively, Raman and infrared-active representations [19]. We note that the bulk optical phonons of Bi2Se3 and Bi2Te3 have been previously measured using Raman [20,26,27,28] and neutron scattering [29], and infrared spectroscopy [19,20,30], Figure 1 shows Raman spectra of Bi2Se3 and Bi2Te3 at various temperatures in the ( ) ̅ ( + ) scattering configuration; note the logarithmic scale. Consistent with previous reports [20,27], the bulk Raman-active modes at 10 K are at 38.5 cm -1 ( 1 ), 75.5 cm -1 ( 1 1 ), 135.8 cm -1…”
Section: Resultsmentioning
confidence: 73%
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“…38 The even g-modes are Raman active and odd u-modes are IR active. Color tics denote the main elemental contribution to the specific mode.…”
Section: Introductionmentioning
confidence: 99%