Bi-induced vibrational modes in GaAsBi

Abstract

We have studied GaAs1-xBix (up to x∼3%) using Raman scattering with two different polarization configurations. Two Bi-induced phonon modes are observed at ∼186 cm-1 and ∼214 cm -1 with increasing Raman intensity as the Bi concentration increases. By comparing Raman selection rules for the observed Bi-induced phonon modes with those for the substitutional N vibrational mode (GaN mode) in GaAsN, the phonon mode at ∼214 cm-1 is identified as originating from substitutional Bi at the As site in GaAsBi. © 2005 Elsevier Ltd. All rights reserved.