Ciano, C. et al. (2019) Control of electron-state coupling in asymmetric Ge/Si−Ge quantum wells. Physical Review Applied, 11(1), 014003. (doi: 10.1103/PhysRevApplied.11.014003)
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Abstract
Theoretical predictions indicate that the n-type Ge / Si − Ge multi-quantum-well system is the most promising material for the realization of a Si -compatible THz quantum cascade laser operating at room temperature. To advance in this direction, we study, both experimentally and theoretically, asymmetric coupled multi-quantum-well samples based on this material system, that can be considered as the basic building block of a cascade architecture. Extensive structural characterization shows the high material quality of strain-symmetrized structures grown by chemical vapor deposition, down to the ultrathin barrier limit. Moreover, THz absorption spectroscopy measurements supported by theoretical modeling unambiguously demonstrate inter-well coupling and wavefunction tunneling. The agreement between experimental data and simulations allows us to characterize the tunneling barrier parameters and, in turn, achieve highly controlled engineering of the electronic structure in forthcoming unipolar cascade systems based on n-type Ge / Si − Ge multi-quantum-wells.
| Item Type: | Articles |
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| Additional Information: | This work is supported by the European Union research and innovation program Horizon 2020 under Grant No. 766719 – FLASH Project. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Paul, Professor Douglas |
| Authors: | Ciano, C., Virgilio, M., Montanari, M., Persichetti, L., Di Gaspare, L., Ortolani, M., Baldassarre, L., Zoellner, M.H., Skibitzki, O., Scalari, G., Faist, J., Paul, D.J., Scuderi, M., Nicotra, G., Grange, T., Birner, S., Capellini, G., and De Seta, M. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | Physical Review Applied |
| Publisher: | American Physical Society |
| ISSN: | 2331-7019 |
| ISSN (Online): | 2331-7019 |
| Published Online: | 02 January 2019 |
| Copyright Holders: | Copyright © 2019 American Physical Society |
| First Published: | First published in Physical Review Applied 11(1): 014003 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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