Abstract
The mechanism to realize the peculiar flat bands generally existing in ( earth) compounds is clarified by analyzing the first-principles band structures and the tight-binding model. These flat bands are constructed from the localized eigenstates, the existence of which is guaranteed by the destructive interference of the intersite hopping among the states at the kagome sites and those between the kagome and honeycomb sites. Their relative positions to other bands can be controlled by varying the lattice parameters keeping their dispersion almost flat, which suggests the possibility of flat-band engineering.
- Received 13 November 2014
- Revised 15 April 2015
DOI:https://doi.org/10.1103/PhysRevB.91.165137
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