磷烯
拉曼光谱
堆积
各向异性
材料科学
黑磷
凝聚态物理
极化(电化学)
半导体
垂直的
电子
光子
声子
带隙
分子物理学
光学
光电子学
化学
物理
核磁共振
几何学
物理化学
量子力学
数学
作者
Henrique B. Ribeiro,M. A. Pimenta,Christiano J. S. de Matos,Roberto L. Moreira,Aleksandr Rodin,Juan D. Zapata,E. A. De Souza,A. H. Castro Neto
出处
期刊:ACS Nano
[American Chemical Society]
日期:2015-03-16
卷期号:9 (4): 4270-4276
被引量:314
标识
DOI:10.1021/acsnano.5b00698
摘要
Anisotropic materials are characterized by a unique optical response, which is highly polarization-dependent. Of particular interest are layered materials formed by the stacking of two-dimensional (2D) crystals that are naturally anisotropic in the direction perpendicular to the 2D planes. Black phosphorus (BP) is a stack of 2D phosphorene crystals and a highly anisotropic semiconductor with a direct band gap. We show that the angular dependence of polarized Raman spectra of BP is rather unusual and can be explained only by considering complex values for the Raman tensor elements. This result can be traced back to the electron–photon and electron–phonon interactions in this material.
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