Polar optical phonons in core-shell semiconductor nanowires

TL;DR

This paper models the long-wavelength polar optical vibrational modes in semiconductor core-shell nanowires using a continuum approach, analyzing the effects of strain on GaAs-GaP nanowires.

Contribution

It introduces a phenomenological continuum model to analyze vibrational modes in core-shell nanowires, including boundary conditions and strain effects.

Findings

Derived transcendental equations for vibrational modes

Numerically calculated polar optical modes for GaAs-GaP nanowires

Analyzed strain effects on vibrational properties

Abstract

We obtain the the long-wavelength polar optical vibrational modes of semiconductor core-shell nanowires by means of a phenomenological continuum model. A basis for the space of solutions is derived, and by applying the appropriate boundary conditions, the transcendental equations for the coupled and uncoupled modes are attained. Our results are applied to the study of the GaAs-GaP core-shell nanowire, for which we calculate numerically the polar optical modes, analyzing the role of strain in the vibrational properties of this nanosystem.