Crystalline Orientation Identification of Multilayer Black Phosphorus Based on the Ag1 and Ag2 Raman Modes for an Orthogonally Polarized Configuration

Li, Rubing; Sun, Mingyuan; Shang, Yongchao; Xing, Huadan; Wang, Xiaojie; Qiu, Wei

doi:10.1021/acs.jpcc.0c10936

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…Here, the time-domain beating is a signature of multiple phonon modes. The Fourier transformation (FT) spectrum in Figure 2c indicates that the CP signal consists of two dominant frequencies, 10.72 and 13.88 THz, which correspond to the Ag 1 and Ag 2 symmetry optical phonons of orthorhombic BP crystal [18][19][20][21]26,27]. As shown in Figure 2c, the phosphorous atoms move largely in the out-of-plane (in-plane) direction within the Ag 1 (Ag 2 ) mode.…”

Section: Resultsmentioning

confidence: 96%

“…Additionally, the anisotropic electron-phonon interaction in BP leads to strongly polarization-dependent Raman scattering behaviors [18][19][20][21][22][23][24][25], where sensitive changes by layer thickness were explained by the interference effect of either the incident or the scattered light [18]. Recently, Raman scattering with an orthogonal polarization configuration and the B 2g Raman mode under a nonanalyzer configuration were demonstrated to be useful in identifying the crystalline orientation of BP [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Generation and Detection of Coherent Ag Phonons in Black Phosphorus

Lee

Yee

2021

Nanomaterials

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Black phosphorus (BP) has attracted great attention due to its layer-tuned direct bandgap, in-plane anisotropic properties, and novel optoelectronic applications. In this work, the anisotropic characteristics of BP crystal in terms of the Raman tensor and birefringence are studied by investigating polarization dependence in both the generation and detection of Ag mode coherent phonons. While the generated coherent phonons exhibit the typical linear dichroism of BP crystal, the detection process is found here to be influenced by anisotropic multiple thin film interference, showing wavelength and sample thickness sensitive behaviors. We additionally find that the Ag1 and Ag2 optical phonons decay into lower frequency acoustic phonons through the temperature-dependent anharmonic process.

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