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arXiv · 2506.14491

Multisubband Plasmons in InAs/GaSb Broken Gap Quantum Well

Wojciech Julian Pasek·Soufiane Hajji·Oussama Tata·Laurent Cerutti·Fernando Gonzalez-posada Flores·Simon Hurand·Abdelouahed El Fatimy·Thierry Taliercio
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Abstract

Multi-subband plasmon (MSP) modes in heavily doped InAs/GaSb broken-gap quantum wells grown via molecular beam epitaxy (MBE) are investigated. An $8$-band $\vec{k} \cdot \vec{p}$ semiclassical model accurately predicts ellipsometric spectra, reflecting strong subband hybridization and non-parabolicity. In contrast, single-band plasmon models show qualitative discrepancies with experiment, even with adjusted effective masses. These findings highlight the potential of broken-gap wells for quantum technologies leveraging interband coupling and wavefunction hybridization.

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Wojciech Julian Pasek, Soufiane Hajji, Oussama Tata, Laurent Cerutti, Fernando Gonzalez-posada Flores, Simon Hurand, Abdelouahed El Fatimy, Thierry Taliercio. 2025-06-17. Multisubband Plasmons in InAs/GaSb Broken Gap Quantum Well. https://arxiv.org/abs/2506.14491

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