Acta Physica Sinica, Volume. 69, Issue 16, 167803-1(2020)
![(a) Crystal structure of black phosphorus; (b) atomic displacements of phonon modes in black phosphorus; (c) phonon dispersion, vibration density of states (VDOS) and schematic diagram of first Brillouin zone of bulk black phosphorus. Raman modes at the Brillouin zone center are labeled[9]](/Images/icon/loading.gif){kind=icon}
Fig. 1. (a) Crystal structure of black phosphorus; (b) atomic displacements of phonon modes in black phosphorus; (c) phonon dispersion, vibration density of states (VDOS) and schematic diagram of first Brillouin zone of bulk black phosphorus. Raman modes at the Brillouin zone center are labeled[9]
Fig. 2. (a) Experimental configuration. The polarization direction of Raman signal is fixed (
). The angle between polarization direction of incident light and 
, which can be changed by rotating a half-wave plate; (b) Raman spectra in the range of
,
,
,
and
modes, under the VV(
) and HV(
) configurations; (c) the
-dependent Raman intensity excited by different wavelengths. The solid lines indicate fitting results.
Fig. 3. (a) Raman spectra of black phosphorus excited by six excitation wavelengths between 473–671 nm. Raman spectra at
and
are given for each excitation. Three main first-order Raman peaks and eleven high-order Raman peaks (P1–P11) are marked by vertical dotted lines; (b) the fitting result of P4–P11 for Raman spectra by six excitations at
.
Fig. 4. Polarization-dependent Raman intensity of P1–P11 Raman modes, excited by 488, 532 and 633 nm lasers.
Table 1. Assignments of high order Raman peaks of BP.
View tableView in ArticleTable 1. Assignments of high order Raman peaks of BP.
Peaks Raman shift /cm–1 Assigned mode Assigned mode in Ref. [ 13 ]Calculated frequency/cm–1 P1 ~688 ${\rm A}_{\rm g}^2 (\varGamma)+B_{3 {\rm g}}^1 (\varGamma)$ ${\rm A}_{\rm g}^2+B_{3 {\rm g}}^1$ 689 P2 ~714 ${\rm B}_{2 {\rm g}} (\varGamma)+2\cdot B_{1 {\rm g}} (X)$ – 715 P3 ~747 $2 \cdot {\rm{A}}_{\rm{g}}^2(\varGamma ){\rm{ - B}}_{{\rm{3 g}}}^{\rm{1}}(\varGamma )$ $2 \cdot {\rm{A}}_{\rm{g}}^2-{{\rm{B}}_{{\rm{1 g}}}}$ 749 P4 ~819 ${\rm B}_{2 {\rm g}} (\varGamma)+B_{1 {\rm g}} (S)+B_{3 {\rm g}}^1 (S)$ – 821 P5 ~831 $2 \cdot {\rm{A} }_{\rm{g} }^2({\rm {near} }\;{{Y} })$ – 832 P6 ~839 $2 \cdot {\rm{A} }_{\rm{g} }^2({{S} })$ – 842 P7 ~855 $2 \cdot {\rm{B} }_{ {\rm{3 g} } }^2(\varGamma )$ – 858 P8 ~864 $2 \cdot { {\rm{B} }_{ {\rm{2 g} } } }({{X} })$ – 864 P9 ~872 $2 \cdot { {\rm{B} }_{2{\rm{g} } } }(\varGamma \;{\rm {or} }\;{ {S} })$ – 874 P10 ~886 ${\rm A}_{\rm g}^1 (X)+ A_{\rm g}^2 (X)$ – 888 P11 ~895 $2 \cdot { {\rm{B} }_{2{\rm{g} } } }({\rm {between}}\;{{X} }\;{\rm {and}}\;{{S} })$ – 896
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Da Meng, Xin Cong, Yu-Chen Leng, Miao-Ling Lin, Jia-Hong Wang, Bin-Lu Yu, Xue-Lu Liu, Xue-Feng Yu, Ping-Heng Tan.
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Received: May. 9, 2020
Accepted: --
Published Online: Jan. 4, 2021
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