| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Willatzen, Morten
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Topics
Publications (17/17 displayed)
- 2022On chain models for contact electrificationcitations
- 2021Piezoelectric tunability and topological insulator transition in a GaN/InN/GaN quantum-well devicecitations
- 2020Strain-engineered widely tunable perfect absorption angle in black phosphorus from first principlescitations
- 2017Acousto-optical phonon excitation in cubic piezoelectric slabs and crystal growth orientation effectscitations
- 2017Acousto-optical phonon excitation in cubic piezoelectric slabs and crystal growth orientation effectscitations
- 2017Pseudocanalization regime for magnetic dark-field hyperlensescitations
- 2015Tunable Broadband Acoustic Gain in Piezoelectric Semiconductors at ε-Near-Zero Responsecitations
- 2013Metadevices for the confinement of sound and broadband double-negativity behavior:Physical Review Bcitations
- 2013Metadevices for the confinement of sound and broadband double-negativity behaviorcitations
- 2013An electromechanical model for a dielectric electroactive polymer generatorcitations
- 2013An Electromechanical Model of a Dielectric ElectroActive Polymer Generatorcitations
- 2013An Electromechanical Model of a Dielectric ElectroActive Polymer Generatorcitations
- 2012Multilayer piezoelectric transducer models combined with Field IIcitations
- 2010Analysis of optical properties of strained semiconductor quantum dots for electromagnetically induced transparency
- 2010Analysis of optical properties of strained semiconductor quantum dots for electromagnetically induced transparency
- 2010Investigations of scattering and field enhancement effects in retardation-based plasmonic nanoantennas
- 2009Parameter sensitivity study of a Field II multilayer transducer model on a convex transducercitations
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article
Acousto-optical phonon excitation in cubic piezoelectric slabs and crystal growth orientation effects
Abstract
In this paper we investigate theoretically the influence of piezoelectric coupling on phonon dispersion relations. Specifically we solve dispersion relations for a fully coupled zinc-blende freestanding quantum well for different orientations of the crystal unit cell. It is shown that the phonon mode density in GaAs can change by a factor of approximately 2–3 at q_xa=1 for different crystal-growth directions relative to the slab thickness direction. In particular, it is found that optical and acoustic phonon modes are always piezoelectrically coupled, independent of the crystal-growth direction, and will be jointly excited by electrical stimulus. We demonstrate this for an electrically excited freestanding slab for two cases of high-symmetry crystal-growth directions and finally show the impact of the Drude model for permittivity on the phonon dispersion. In particular, it is verified that the piezoelectric effect leads to a drastically enhanced coupling of acoustic and optical phonon modes and increase in the local phonon density of states near the plasma frequency where the permittivity approaches zero.