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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
; | | Date: |
10 Jun 2006 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Materials Science | | 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 $2pi n/d$, 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. | | Source: | arXiv, cond-mat/0606266 | | Services: | Forum | Review | PDF | Favorites | |
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