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Multisubband plasmons in an InAs/GaSb broken-gap quantum well
Phys. Rev. B 112, 205412 – Published 12 November, 2025
DOI: https://doi.org/10.1103/rq1z-6sg7
Abstract
Multisubband plasmon (MSP) modes in heavily doped InAs/GaSb broken-gap quantum wells grown via molecular beam epitaxy (MBE) are investigated. An eight-band semiclassical model accurately predicts ellipsometric spectra, reflecting strong subband hybridization and nonparabolicity. 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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