Unusual Angular Dependence of the Raman Response in Black Phosphorus

Author(s)

Ribeiro, Henrique B. ^[1] ; Pimenta, Marcos A. ^[2] ; de Matos, Christiano J. S. ^[1] ; Moreira, Roberto Luiz ^[2] ; Rodin, Aleksandr S. ^{[3, 4]} ; Zapata, Juan D. ^{[5, 1]} ; de Souza, Eunezio A. T. ^[1] ; Castro Neto, Antonio H. ^{[3, 4, 6, 7]}

Affiliation

^[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil

^[2] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG - Brazil

^[3] Natl Univ Singapore, Ctr Adv Mat 2D, Fac Sci, Singapore 119077 - Singapore

^[4] Natl Univ Singapore, Fac Sci, Graphene Res Ctr, Singapore 119077 - Singapore

^[5] Univ Antioquia, Medellin - Colombia

^[6] Natl Univ Singapore, Fac Sci, Dept Phys, Singapore 119077 - Singapore

^[7] Natl Univ Singapore, Natl Grad Sch Integrat Sci & Engn, Singapore 119077 - Singapore

• Document type: Journal article
• Source: ACS NANO; v. 9, n. 4, p. 4270-4276, APR 2015.
• Web of Science Citations: 138

Abstract

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. (AU)

• FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
• Grantee: Antônio Hélio de Castro Neto
• Support type: Research Projects - SPEC Program