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Monte-Carlo simulations of Gunn diodes and hot-phonon effects in bulk semiconductors (2016)
Thesis
Appleyard, N. (2016). Monte-Carlo simulations of Gunn diodes and hot-phonon effects in bulk semiconductors. (Thesis). University of Hull. Retrieved from https://hull-repository.worktribe.com/output/4219588

This thesis uses Monte Carlo simulations to investigate electron transport in GaAs, its ternary In0.₅₃Ga₀.₄₇As and GaN. Ensemble Monte Carlo methods are used to determine the effects of a non-equilibrium phonon distribution on the transport propertie... Read More about Monte-Carlo simulations of Gunn diodes and hot-phonon effects in bulk semiconductors.

Dispersion and the electron-phonon interaction in a single heterostructure (2016)
Journal Article
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

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 con... Read More about Dispersion and the electron-phonon interaction in a single heterostructure.

Phonon emission and arrival times of electrons from a single-electron source (2016)
Journal Article
Emary, C., Dyson, A., Ryu, S., Sim, H.-S., & Kataoka, M. (2016). Phonon emission and arrival times of electrons from a single-electron source. Physical Review B, 93(3), Article ARTN 035436. https://doi.org/10.1103/PhysRevB.93.035436

In recent charge-pump experiments, single electrons are injected into quantum Hall edge channels at energies significantly above the Fermi level. We consider here the relaxation of these hot edge-channel electrons through longitudinal-optical-phonon... Read More about Phonon emission and arrival times of electrons from a single-electron source.

Hot phonon effects on high field transport in GaN & AlN (2015)
Journal Article
Dyson, A., Naylor, D. R., & Ridley, B. K. (2015). Hot phonon effects on high field transport in GaN & AlN. IEEE transactions on electron devices, 62(11), 3613-3618. https://doi.org/10.1109/TED.2015.2476383

We have studied the effects of hot phonons on the high-field transport in GaN & AlN. The dynamics of the non-equilibrium electron-LO phonon system is studied via an ensemble Monte-Carlo code. We find that under steady-state conditions the hot-phonons... Read More about Hot phonon effects on high field transport in GaN & AlN.

Hot electron energy relaxation in lattice-matched InAlN/AlN/GaN heterostructures: The sum rules for electron-phonon interactions and hot-phonon effect (2015)
Journal Article
Zhang, J. .-Z., Dyson, A., & Ridley, B. K. (2015). Hot electron energy relaxation in lattice-matched InAlN/AlN/GaN heterostructures: The sum rules for electron-phonon interactions and hot-phonon effect. Journal of applied physics, 117(2), Article ARTN 025701. https://doi.org/10.1063/1.4905717

Using the dielectric continuum (DC) and three-dimensional phonon (3DP) models, energy relaxation of the hot electrons in the quasi-two-dimensional channel of lattice-matched InAlN/AlN/GaN heterostructures is studied theoretically, taking into account... Read More about Hot electron energy relaxation in lattice-matched InAlN/AlN/GaN heterostructures: The sum rules for electron-phonon interactions and hot-phonon effect.

Negative differential resistance associated with hot phonons (2012)
Journal Article
Dyson, A., & Ridley, B. K. (2012). Negative differential resistance associated with hot phonons. Journal of applied physics, 112(6), 063707. https://doi.org/10.1063/1.4754012

We predict the existence of a hot-phonon negative differential resistance (NDR) in GaN. We show that this is a consequence of a wave-vector dependence of lifetime caused by the effect of coupled plasmon-phonons. Anti-screened long-wavelength modes ha... Read More about Negative differential resistance associated with hot phonons.

Development of Monte-Carlo simulations for III-V semiconductors employing an analytic band-structure (2012)
Thesis
Naylor, D. R. (. R. (2012). Development of Monte-Carlo simulations for III-V semiconductors employing an analytic band-structure. (Thesis). University of Hull. Retrieved from https://hull-repository.worktribe.com/output/4213458

The thesis is primarily concerned with the III-V-N semiconductors Gallium Nitride (GaN) and the dilute nitride Gallium Nitrogen Arsenide (GaNAs) and the effect that the band structure has on electron transport in these materials. Ensemble Monte-Carlo... Read More about Development of Monte-Carlo simulations for III-V semiconductors employing an analytic band-structure.

Momentum relaxation due to polar optical phonons in AlGaN/GaN heterostructures (2011)
Journal Article
Zhang, J.-Z., Zhang, J.-Z., Dyson, A., & Ridley, B. K. (2011). Momentum relaxation due to polar optical phonons in AlGaN/GaN heterostructures. Physical review B: Condensed matter and materials physics, 84(15), Article ARTN 155310. https://doi.org/10.1103/PhysRevB.84.155310

Using the dielectric continuum (DC) model, momentum relaxation rates are calculated for electrons confined in quasi-two-dimensional (quasi-2D) channels of AlGaN/GaN heterostructures. Particular attention is paid to the effects of half-space and inter... Read More about Momentum relaxation due to polar optical phonons in AlGaN/GaN heterostructures.

Novel antenna-integrated photodiodes with strained absorbers designed for use as terahertz sources (2011)
Journal Article
Henning, I. D., Adams, M. J., Vaughan, M., Abraham, T., Sun, Y., Dyson, A., Moodie, D. G., Rogers, D. C., Cannard, P. J., Dosanjh, S., Skuse, M., & Firth, R. J. (2011). Novel antenna-integrated photodiodes with strained absorbers designed for use as terahertz sources. IEEE Journal of Selected Topics in Quantum Electronics, 17(1), 202-209. https://doi.org/10.1109/jstqe.2010.2049196

We present experimental results on the performance of antenna-integrated photodiodes intended for use as photomixers to provide a tunable broadband source of terahertz (THz) radiation. In a balanced strain-absorber structure, we show that the introdu... Read More about Novel antenna-integrated photodiodes with strained absorbers designed for use as terahertz sources.

What is to be done? Implications for policy makers (2009)
Book Chapter
Dyson, A., Gunter, H., Hall, D., Raffo, C., & Jones, L. (2009). What is to be done? Implications for policy makers. In C. Raffo, A. Dyson, H. Gunter, D. Hall, L. Jones, & A. Kalambouka (Eds.), Education and poverty in affluent countries (195-215). Routledge. https://doi.org/10.4324/9780203860335

The review of frameworks and interventions in the previous chapter makes it abundantly clear that policy makers in Western democracies have been highly active in attempting to break the link between poverty and education. England and the US may be ex... Read More about What is to be done? Implications for policy makers.

Phonon-plasmon coupled-mode lifetime in semiconductors (2008)
Journal Article
Dyson, A., & Ridley, B. K. (2008). Phonon-plasmon coupled-mode lifetime in semiconductors. Journal of applied physics, 103(11), 114507. https://doi.org/10.1063/1.2937918

Raman scattering measurements of the lifetime of hot phonons in GaN show a decrease with increasing electron concentration. Density-dependent lifetimes have also been deduced from noise measurements of AlGaN/GaN channels. We suggest that the results... Read More about Phonon-plasmon coupled-mode lifetime in semiconductors.