Optical phonon modes of wurtzite InP

TL;DR

This study investigates optical phonon modes in wurtzite InP nanowires using Raman spectroscopy and theoretical modeling, identifying key vibrational modes and calculating dispersion relations that align with experimental data.

Contribution

It provides the first detailed analysis of optical phonon modes in wurtzite InP nanowires, combining experimental Raman data with theoretical dispersion calculations.

Findings

Identification of A1(TO), E2h, and E1(TO) phonon modes

Observation of forbidden longitudinal optical modes

Good agreement between calculated and experimental dispersion relations

Abstract

Optical vibration modes of InP nanowires in the wurtzite phase were investigated by Raman scattering spectroscopy. The wires were grown along the [0001] axis by the vapor-liquid-solid method. The A1(TO), E2h and E1(TO) phonon modes of the wurtzite symmetry were identified by using light linearly polarized along different directions in backscattering configuration. Additionally, forbidden longitudinal optical modes have also been observed. Furthermore, by applying an extended 11-parameter rigid-ion model the complete dispersion relations of InP in the wurtzite phase have been calculated, showing a good agreement with the Raman experimental data.