Maspero, R., Sweeney, S.J. and Florescu, M. (2017) Unfolding the band structure of GaAsBi. Journal of Physics: Condensed Matter, 29, 075001. (doi: 10.1088/1361-648X/aa50d7) (PMID:28008883)
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Abstract
Typical supercell approaches used to investigate the electronic properties of GaAs(1−x)Bi(x) produce highly accurate, but folded, band structures. Using a highly optimized algorithm, we unfold the band structure to an approximate E(k) relation associated with an effective Brillouin zone. The dispersion relations we generate correlate strongly with experimental results, confirming that a regime of band gap energy greater than the spin–orbit-splitting energy is reached at around 10% bismuth fraction. We also demonstrate the effectiveness of the unfolding algorithm throughout the Brillouin zone (BZ), which is key to enabling transition rate calculations, such as Auger recombination rates. Finally, we show the effect of disorder on the effective masses and identify approximate values for the effective mass of the conduction band and valence bands for bismuth concentrations from 0–12%.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Sweeney, Professor Stephen |
| Authors: | Maspero, R., Sweeney, S.J., and Florescu, M. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | Journal of Physics: Condensed Matter |
| Publisher: | IOP Publishing |
| ISSN: | 0953-8984 |
| ISSN (Online): | 1361-648X |
| Published Online: | 23 December 2016 |
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