Journal
NANOSCALE RESEARCH LETTERS
Volume 8, Issue -, Pages 1-11Publisher
SPRINGEROPEN
DOI: 10.1186/1556-276X-8-111
Keywords
Density functional theory; Valley splitting; d-Doped layers; Phosphorus in silicon; Basis sets
Funding
- ARC [DP0986635]
- Australian Commonwealth Government
- Australian Research Council [DP0986635] Funding Source: Australian Research Council
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The differences in energy between electronic bands due to valley splitting are of paramount importance in interpreting transport spectroscopy experiments on state-of-the-art quantum devices defined by scanning tunnelling microscope lithography. Using vasp, we develop a plane-wave density functional theory description of systems which is size limited due to computational tractability. Nonetheless, we provide valuable data for the benchmarking of empirical modelling techniques more capable of extending this discussion to confined disordered systems or actual devices. We then develop a less resource-intensive alternative via localised basis functions in siesta, retaining the physics of the plane-wave description, and extend this model beyond the capability of plane-wave methods to determine the ab initio valley splitting of well-isolated delta-layers. In obtaining an agreement between plane-wave and localised methods, we show that valley splitting has been overestimated in previous ab initio calculations by more than 50%.
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