Title

Individual Phonon-Phonon Processes in GaAs

Presenter Information

Brett Ballard

Department

Physics

Major

Physics and Applied Mathematics

Research Advisor

Chernatynskiy, Aleksandr V.

Advisor's Department

Physics

Funding Source

Dr. Chernatynskiy

Abstract

Experimental data on individual phonon-phonon interaction processes is rare and permits detailed experimental confirmation of the recently developed computational methods. Here, we present the theoretical explanation of the recent laboratory experiments using computer simulations. The experiment studied the longitudinal acoustic phonons at low temperature and high frequency for GaAs superlattices. The experimental data found deviation from the Herring process contribution estimations at 50 K which we verified computationally. We further explore individual phonon processes looking for possible explanations to this apparent breakdown of Herring processes in order to gain a better understanding of longitudinal acoustic phonon propagation in GaAs.

Biography

Brett Ballard is a junior from Warrensburg, MO pursuing a dual major in physics and applied mathematics. Aside from having a 4.0 gpa, he has been serving as SPS(Society of Physics Students) President for Fall 2018 and Spring 2019. Brett plans to pursue a Ph.D. in physics upon completion of both of his bachelor’s in the spring of 2020. He has been researching phonon propagation and interactions with Dr. Chernatynskiy of the physics department since May 2018.

Research Category

Sciences

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium

Presentation Date

16 Apr 2019, 9:00 am - 3:00 pm

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Apr 16th, 9:00 AM Apr 16th, 3:00 PM

Individual Phonon-Phonon Processes in GaAs

Upper Atrium

Experimental data on individual phonon-phonon interaction processes is rare and permits detailed experimental confirmation of the recently developed computational methods. Here, we present the theoretical explanation of the recent laboratory experiments using computer simulations. The experiment studied the longitudinal acoustic phonons at low temperature and high frequency for GaAs superlattices. The experimental data found deviation from the Herring process contribution estimations at 50 K which we verified computationally. We further explore individual phonon processes looking for possible explanations to this apparent breakdown of Herring processes in order to gain a better understanding of longitudinal acoustic phonon propagation in GaAs.