Journal
PHYSICAL REVIEW B
Volume 83, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.085201
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Funding
- Austrian Fonds zur Forderung der wissenschaftlichen Forschung
- CINECA-HPC center
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We perform a comparative ab initio study of Mn-doped germanium semiconductor using the Perdew-Burke-Ernzerhof exchange-correlation functional, density functional theory (DFT) + U, and Heyd-Scuseria-Ernzerhof hybrid functional (HSE). We show that the HSE functional is able to correctly account for the relevant ground-state properties of the host matrix as well as of the Mn-doped semiconductor. Although the DFT + U and the HSE description are very similar, some differences still remain. In particular, the half metallicity is lost using DFT + U when a suitable U value, tuned to recover the photoemission spectra, is employed. For comparison, we also discuss the case of Mn in silicon.
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