Comparison of the {bold k}{center_dot}{bold p} and the direct diagonalization approaches for describing the electronic structure of quantum dots
- National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)
It is shown that the standard (decoupled) 6{times}6k{center_dot}p effective-mass approach for semiconductor quantum dots overestimates significantly the hole and electron confinement energies, and, for dots made of materials with small spin-orbit coupling (e.g., phosphides, sulphides) produces a reverse order of {ital s}- and {ital p}-like valence states. By contrasting the electronic structures of dots as obtained by a direct diagonalization (multiband) pseudopotential approach and by its k{center_dot}p approximation, we are able to trace the systematic errors of k{center_dot}p in dots to the k{center_dot}p errors in the underlying bulk solids. This suggests a {open_quotes}diagnostic tool{close_quotes} and a strategy for improving the k{center_dot}p. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 550433
- Journal Information:
- Applied Physics Letters, Vol. 71, Issue 23; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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