Issue 46, 2018

Anisotropic ultraviolet-plasmon dispersion in black phosphorus

Abstract

By means of momentum-resolved electron energy loss spectroscopy (EELS) coupled with scanning transmission electron microscopy, we have studied the dispersion relation of interband plasmonic modes in the ultraviolet in black phosphorus. We find that the dispersion of the interband plasmons is anisotropic. Experimental results are reproduced by density functional theory, by taking into account both the anisotropy of the single-particle response function, arising from the anisotropic band structure, and the damping. Moreover, our theoretical model also indicates the presence of low-energy excitations in the near-infrared that are selectively active in the armchair direction, whose existence has been experimentally validated by high-resolution EELS (HREELS) in reflection mode.

Graphical abstract: Anisotropic ultraviolet-plasmon dispersion in black phosphorus

Supplementary files

Article information

Article type
Paper
Submitted
08 Jul 2018
Accepted
11 Nov 2018
First published
12 Nov 2018

Nanoscale, 2018,10, 21918-21927

Author version available

Anisotropic ultraviolet-plasmon dispersion in black phosphorus

G. Nicotra, E. van Veen, I. Deretzis, L. Wang, J. Hu, Z. Mao, V. Fabio, C. Spinella, G. Chiarello, A. Rudenko, S. Yuan and A. Politano, Nanoscale, 2018, 10, 21918 DOI: 10.1039/C8NR05502E

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