Journal
ACS NANO
Volume 9, Issue 4, Pages 4270-4276Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00698
Keywords
black phosphorus; phosphorene; polarized Raman spectroscopy; linear dichroism; electron-phonon coupling
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Funding
- Fapesp (SPEC) [2012/50259-8]
- Brazilian Nanocarbon Institute of Science and Technology (INCT/Nanocarbono)
- CNPq
- National Research Foundation, Prime Minister's Office, Singapore, under its Medium Sized Centre Programme
- CRP award Novel 2D materials with tailored properties: beyond graphene [R-144-000-295-281]
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Anisotropic materials are characterized by a unique optical response, which is highly polarization-dependent. Of particular interest are layered materials formed by the stacking of two-dimensional (2D) crystals that are naturally anisotropic in the direction perpendicular to the 2D planes. Black phosphorus (BP) is a stack of 213 phosphorene crystals and a highly anisotropic semiconductor with a direct band gap. We show that the angular dependence of polarized Raman spectra of BP is rather unusual and can be explained only by considering complex values for the Raman tensor elements. This result can be traced back to the electron photon and electron-phonon interactions in this material.
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