@article{69e8d0c7c6b4439b9676e2a60a5b2132,
title = "Acoustic band engineering in terahertz quantum-cascade lasers and arbitrary superlattices",
abstract = "We present theoretical methods for the analysis of acoustic phonon modes in superlattice structures, and terahertz-frequency quantum-cascade lasers (THz QCLs). Our generalized numerical solution of the acoustic-wave equation provides good agreement with experimental pump-probe measurements of the acoustic resonances in a THz QCL. We predict that the detailed layer structure in THz QCLs imprints up to ∼2GHz detuning of the acoustic mode spacing, which cannot be seen in analytical models. This effect is strongest in devices with large and abrupt acoustic mismatch between layers. We use an acoustic deformation potential within a density-matrix approach to analyze electron transport induced in a range of the most common THz QCL active-region design schemes. We conclude that acoustic modes up to ∼200GHz are capable of significantly perturbing QCL transport, highlighting their potential for ultrafast modulation of laser emission.",
keywords = "Terahertz (THz), phonons, Quantum Cascade Laser, Superlattices",
author = "Aleksandar Demi{\'c} and Alexander Valavanis and Paul Dean and Lianhe Li and Davies, {Giles A.} and Linfield, {Edmund H.} and Cunningham, {John E.} and James Bailey and Andrey Akimov and Anthony Kent and Paul Harrison",
note = "Funding Information: This work was supported financially by the Engineering and Physical Sciences Research Council (EPSRC) UK (Grants No. EP/V004743/1, No. EP/V004751/1, No. EP/P021859/1, No. EP/W028921/1, and No. EP/W033054/1), and the Medical Research Council (MRC) UK (UK Research and Innovation, Future Leader Fellowship MR/S016929/1). This work was undertaken on ARC4, part of the High Performance Computing facilities at the University of Leeds, UK. For the purpose of open access, the author has applied a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising from this submission. Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",
year = "2023",
month = jun,
day = "15",
doi = "10.1103/PhysRevB.107.235411",
language = "English",
volume = "107",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "2469-9950",
publisher = "American Physical Society",
number = "23",
}
