Details

Autor(en) / Beteiligte

• Ling, Xi
• Huang, Shengxi
• Hasdeo, Eddwi H
• Liang, Liangbo
• Parkin, William M
• Tatsumi, Yuki
• Nugraha, Ahmad R. T
• Puretzky, Alexander A
• Das, Paul Masih
• Sumpter, Bobby G
• Geohegan, David B
• Kong, Jing
• Saito, Riichiro
• Drndic, Marija
• Meunier, Vincent
• Dresselhaus, Mildred S

Titel

Anisotropic Electron-Photon and Electron-Phonon Interactions in Black Phosphorus

Ist Teil von

• Nano letters, 2016-04, Vol.16 (4), p.2260-2267

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.