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

Multisubband Plasmons in InAs/GaSb Broken Gap Quantum Well

Mesoscale and Nanoscale Physics 2025-06-18 v1

Authors: 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.

Keywords

plasmon quantum well InAs/GaSb broken gap ellipsometry

Cite

@article{arxiv.2506.14491,
  title  = {Multisubband Plasmons in InAs/GaSb Broken Gap Quantum Well},
  author = {Wojciech Julian Pasek and Soufiane Hajji and Oussama Tata and Laurent Cerutti and Fernando Gonzalez-posada Flores and Simon Hurand and Abdelouahed El Fatimy and Thierry Taliercio},
  journal= {arXiv preprint arXiv:2506.14491},
  year   = {2025}
}

Multisubband Plasmons in InAs/GaSb Broken Gap Quantum Well

Abstract

Keywords

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