Demić, A orcid.org/0000-0003-1335-6156, Valavanis, A orcid.org/0000-0001-5565-0463, Dean, P orcid.org/0000-0002-3950-4359 et al. (8 more authors) (2023) Acoustic band engineering in terahertz quantum-cascade lasers and arbitrary superlattices. Physical Review B, 107 (23). 235411. ISSN 1098-0121
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This item is protected by copyright. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/V004743/1 EPSRC (Engineering and Physical Sciences Research Council) EP/P021859/1 EPSRC (Engineering and Physical Sciences Research Council) EP/W028921/1 MRC (Medical Research Council) MR/S016929/1. EPSRC (Engineering and Physical Sciences Research Council) EP/M01598X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 May 2023 11:10 |
Last Modified: | 21 Jan 2025 13:02 |
Status: | Published |
Publisher: | American Physical Society |
Identification Number: | 10.1103/PhysRevB.107.235411 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:199428 |