Electronic structure and lattice dynamics of black phosphorus
Jyun-Han Chen (陳軍翰)1*, Sankar Raman2, Fan-Cheng Chou (周方正)2, Hsiang-Lin Liu (劉祥麟)1
1Department of Physics, National Taiwan Normal University, Taipei, Taiwan
2Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan
* presenting author:Jyun-Han Chen, email:xginochen@gmail.com
Spectroscopic ellipsometry and Raman scattering measurements of single-crystal black phosphorus are presented. The room temperature optical absorption spectrum shows four bands at approximately 3.00, 3.88, 4.89, and 5.81 eV. On the basis of first-principles calculations, the first two peaks were assigned to transitions between occupied py and unoccupied px states. The higher energy peaks were attributed to transitions between occupied py and unoccupied px / pz states. Furthermore, three Raman-active phonon modes are observed at approximately 361, 439, and 466 cm-1 , displaying Ag1, B2g, and Ag2 symmetries. The temperature dependence of these electronic and vibrational excitations will be discussed.

Keywords: black phosphorus, single crystal, spectroscopic ellipsometry, Raman