期刊
NANO LETTERS
卷 16, 期 4, 页码 2260-2267出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04540
关键词
In-plane anisotropy; Raman spectroscopy; optical absorption; crystalline orientation; optical selection rule
类别
资金
- National Science Foundation grant 2DARE [EFRI-1542815]
- U.S. Department of Energy [DE-SC0001299]
- Leading Graduate Schools Program from Tohoku University
- MEXT [25107005]
- NSF
- Office of Naval Research
- Eugene P. Wigner Fellow at the Oak Ridge National Laboratory
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- U.S. Department of Energy (DOE) [DE-SC0001299] Funding Source: U.S. Department of Energy (DOE)
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1542815] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [25107005] Funding Source: KAKEN
Orthorhombic black phosphorus (BP) and other layered materials, such as gallium telluride (GaTe) and tin selenide (SnSe), stand out among two-dimensional (2D) materials owing to their anisotropic in-plane structure. This anisotropy adds a new dimension to the properties of 2D materials and stimulates the development of angle-resolved photonics and electronics. However, understanding the effect of anisotropy has remained unsatisfactory to date, as shown by a number of inconsistencies in the recent literature. We use angle-resolved absorption and Raman spectroscopies to investigate the role of anisotropy on the electron photon and electron phonon interactions in BP. We highlight, both experimentally and theoretically, a nontrivial dependence between anisotropy and flake thickness and photon and phonon energies. We show that once understood, the anisotropic optical absorption appears to be a reliable and simple way to identify the crystalline orientation of BP, which cannot be determined from Raman spectroscopy without the explicit consideration of excitation wavelength and flake thickness, as commonly used previously.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据