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Resonance-like piezoelectric electron-phonon interaction in layered structures

B. A. Glavin·V. A. Kochelap·T. L. Linnik·A. J. Kent·N. M. Stanton·M. Henini
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Abstract

We show that mismatch of the piezoelectric parameters between layers of multiple-quantum well structures leads to modification of the electron-phonon interaction. In particular, short-wavelength phonons propagating perpendicular to the layers with wavevector close to $2πn/d$, where $d$ is the period of the structure, induce a strong smoothly-varying component of the piezo-potential. As a result, they interact efficiently with 2D electrons. It is shown, that this property leads to emission of collimated quasi-monochromatic beams of high-frequency acoustic phonons from hot electrons in multiple-quantum well structures. We argue that this effect is responsible for the recently reported monochromatic transverse phonon emission from optically excited GaAs/AlAs superlattices, and provide additional experimental evidences of this.

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B. A. Glavin, V. A. Kochelap, T. L. Linnik, A. J. Kent, N. M. Stanton, M. Henini. 2006-06-10. Resonance-like piezoelectric electron-phonon interaction in layered structures. https://doi.org/10.1103/physrevb.74.165317

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