Unusual Angular Dependence of the Raman Response in Black Phosphorus

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 pho...

Full description

Saved in:
Bibliographic Details
Published in:ACS nano 2015-04, Vol.9 (4), p.4270-4276
Main Authors: Ribeiro, Henrique B, Pimenta, Marcos A, de Matos, Christiano J. S, Moreira, Roberto Luiz, Rodin, Aleksandr S, Zapata, Juan D, de Souza, Eunézio A. T, Castro Neto, Antonio H
Format: Article
Language:English
Subjects:
Anisotropy
Crystals
Dichroism
Mathematical analysis
Phosphorus
Semiconductors
Stacking
Two dimensional
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 2D 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.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.5b00698