Picosecond acoustics in single quantum wells of cubic GaN/(Al,Ga)N

Picosecond acoustics in single quantum wells of cubic GaN/(Al,Ga)N

A picosecond acoustic pulse is used to study the photoelastic interaction in single zinc-blende GaN/AlxGa1−xN quantum wells. We use an optical time-resolved pump-probe setup and demonstrate that tuning the photon energy to the quantum well’s lowest electron-hole transition makes the experiment sensi...

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Bibliographic Details
Main Authors: Czerniuk, T., Ehrlich, T., Wecker, T., As, D.J., Yakovlev, D.R., Akimov, A.V., Bayer, M.
Format: Article
Published: American Physical Society 2017
Online Access:https://eprints.nottingham.ac.uk/41606/
Description
Summary:A picosecond acoustic pulse is used to study the photoelastic interaction in single zinc-blende GaN/AlxGa1−xN quantum wells. We use an optical time-resolved pump-probe setup and demonstrate that tuning the photon energy to the quantum well’s lowest electron-hole transition makes the experiment sensitive to the quantum well only. Because of the small width, its temporal and spatial resolution allows us to track the few-picosecond-long transit of the acoustic pulse. We further deploy a model to analyze the unknown photoelastic coupling strength of the quantum well for different photon energies and find good agreement with the experiments.

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