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Anisotropic Particle-Hole Excitations in Black Phosphorus

Authors
  • Schuster, R.
  • Trinckauf, J.
  • Knupfer, M.
  • Büchner, B.
Type
Preprint
Publication Date
Mar 09, 2015
Submission Date
Mar 09, 2015
Identifiers
arXiv ID: 1503.02549
Source
arXiv
License
Yellow
External links

Abstract

We report about the energy and momentum resolved optical response of black phosphorus (BP) in its bulk form. Along the armchair direction of the puckered layers we find a highly dispersive mode that is trongly suppressed in the perpendicular (zig-zag) direction. This mode emerges out of the single-particle continuum for finite values of momentum and is therefore interpreted as an exciton. We argue that this exciton, which has already been predicted theoretically for phosphorene -- the monolayer form of BP -- can be detected by conventional optical spectroscopy in the two-dimensional case and might pave the way for optoelectronic applications of this emerging material.

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