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

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

Research output: Contribution to journalArticle

174 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2260-2267
Number of pages8
JournalNano Letters
Volume16
Issue number4
DOIs
Publication statusPublished - 2016 Apr 13

Keywords

  • In-plane anisotropy
  • Raman spectroscopy
  • crystalline orientation
  • optical absorption
  • optical selection rule

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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    Ling, X., Huang, S., Hasdeo, E. H., Liang, L., Parkin, W. M., Tatsumi, Y., Nugraha, A. R. T., Puretzky, A. A., Das, P. M., Sumpter, B. G., Geohegan, D. B., Kong, J., Saito, R., Drndic, M., Meunier, V., & Dresselhaus, M. S. (2016). Anisotropic Electron-Photon and Electron-Phonon Interactions in Black Phosphorus. Nano Letters, 16(4), 2260-2267. https://doi.org/10.1021/acs.nanolett.5b04540