Room temperature operation of n-type Ge/SiGe terahertz quantum cascade lasers predicted by non-equilibrium Green's functions

Grange, T. et al. (2019) Room temperature operation of n-type Ge/SiGe terahertz quantum cascade lasers predicted by non-equilibrium Green's functions. Applied Physics Letters, 114(11), 111102. (doi: 10.1063/1.5082172)

Abstract

n-type Ge/SiGe terahertz quantum cascade lasers are investigated using non-equilibrium Green's functions calculations. We compare the temperature dependence of the terahertz gain properties with an equivalent GaAs/AlGaAs quantum cascade laser design. In the Ge/SiGe case, the gain is found to be much more robust to temperature increase, enabling operation up to room temperature. The better temperature robustness with respect to III–V is attributed to the much weaker interaction with optical phonons. The effect of lower interface quality is investigated and can be partly overcome by engineering smoother quantum confinement.

• Item Type: Articles
• Additional Information: This project was funded by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 766719 (FLASH).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Paul, Professor Douglas
• Authors: Grange, T., Stark, D., Scalari, G., Faist, J., Persichetti, L., Di Gaspare, L., De Seta, M., Ortolani, M., Paul, D. J., Capellini, G., Birner, S., and Virgilio, M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Applied Physics Letters
• Publisher: AIP Publishing
• ISSN: 0003-6951
• ISSN (Online): 1077-3118
• Published Online: 20 March 2019
• Copyright Holders: Copyright © 2019 The Authors
• First Published: First published in Applied Physics Letters 114(11): 111102
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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