Unambiguous determination of crystal orientation in black phosphorus by angle-resolved polarized Raman spectroscopy

Autor:	Cho-Tung Yip, Yan Zhou, Meng Zhang, Huarui Sun, Bo Zou, Xu Zhang, Yadong Wei, Weiqi Li, Xiaobin Chen, Dingning Ke
Rok vydání:	2021
Předmět:	Coupling Crystal symbols.namesake Materials science Phonon symbols Crystal orientation General Materials Science Anisotropy Raman spectroscopy Interference (wave propagation) Molecular physics Black phosphorus
Zdroj:	Nanoscale Horizons. 6:809-818
ISSN:	2055-6764 2055-6756
DOI:	10.1039/d1nh00220a
Popis:	Angle-resolved polarized Raman spectroscopy (ARPRS) is widely used to determine the crystal orientations of anisotropic layered materials (ALMs), which is an essential step to study all of their anisotropic properties. However, the understanding of the ARPRS response of black phosphorous (BP) as a most widely studied ALM is still unsatisfactory. Here, we clarify two key controversies about the physical origin of the intricate ARPRS response and the determination of crystal orientations in BP. Through systematic ARPRS measurements, we show that the degree of anisotropy of the response evolves gradually and periodically with the BP thickness, eventually leading to the intricate response. Meanwhile, we find that using the Raman peak intensity ratio of the two Ag phonon modes, the crystal orientations of BP can be unambiguously distinguished via a concise inequality . Comprehensive analysis and first-principles calculations reveal that the external anisotropic interference effect and the intrinsic electron-phonon coupling are responsible for the observations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff1bf24b0c6479256da3633dfa120789 https://doi.org/10.1039/d1nh00220a Zobrazit plný text záznamu