Dispersion and the electron-phonon interaction in a single heterostructure

Naylor, Daniel R.; Dyson, Angela; Ridley, B. K.

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.

Citation

Naylor, D. R., Dyson, A., & Ridley, B. K. (2017). Dispersion and the electron-phonon interaction in a single heterostructure. Physica E: Low-dimensional Systems and Nanostructures, 86, 218-224. https://doi.org/10.1016/j.physe.2016.06.027

• Journal Article Type: Article
• Acceptance Date: Jun 30, 2016
• Online Publication Date: Jul 1, 2016
• Publication Date: 2017-02
• Deposit Date: Jul 12, 2016
• Publicly Available Date: Jul 12, 2016
• Journal: Physica. E, Low-dimensional systems and nanostructures
• Print ISSN: 1386-9477
• Electronic ISSN: 1873-1759
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 86
• Pages: 218-224
• DOI: https://doi.org/10.1016/j.physe.2016.06.027
• Keywords: Semiconductor heterostructures; Phonon modes; Hybrid model; Scattering
• Public URL: https://hull-repository.worktribe.com/output/440815
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S1386947716306920
• Additional Information: Authors' accepted manuscript of article published in: Physica. E, Low-dimensional systems and nanostructures, 2016, v.86