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Dispersion and the electron–phonon interaction in a single heterostructure

Lookup NU author(s): Dr Daniel NaylorORCiD

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Abstract

We investigate the electron–phonon interaction in a polar–polar single heterostructure through the use of the linear combination of hybrid phonon modes, considering the role of longitudinal optical, transverse optical and interface modes, using a continuum model that accounts for both mechanical and electrical continuity over a heterostructure interface. We discuss the use of other models for such systems, such as the bulk phonon (3DP) and dielectric continuum (DC) models, using previously developed sum-rules to explain the limitations on their validity. We find that our linear combination (LC) model gives an excellent agreement with scattering rates previously derived using the 3DP and DC models when the lattice dispersion is weak enough to be ignored, however, when there is a noticeable lattice dispersion, the LC model returns a different answer, suggesting that interface modes play a much greater part in the scattering characteristics of the system under certain conditions. We also discuss the remote phonon effect in polar/polar heterostructures.

Publication metadata

Author(s): Naylor DR, Dyson A, Ridley BK

Publication type: Article

Publication status: Published

Journal: Physica E: Low-dimensional Systems and Nanostructures

Year: 2017

Volume: 86

Pages: 218-224

Print publication date: 01/02/2017

Online publication date: 01/07/2016

Acceptance date: 30/06/2016

ISSN (print): 1386-9477

ISSN (electronic): 1873-1759

Publisher: Elsevier

URL: https://doi.org/10.1016/j.physe.2016.06.027

DOI: 10.1016/j.physe.2016.06.027

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