Abstract
A method of representation of a crystal structure as a set of its constituent Bravais sublattices is developed. The conditions for compatibility of sublattices related to the same or different systems are formulated and the connection matrices for primitive parallel-translation vectors of the crystal lattice and the sublattices are determined. A method of alignment of the first Brillouin zones of the sublattices with the first Brillouin zone of the crystal is described. It is shown that alignment may lead to quasi-degeneration of the energy levels in the case of weak hybridization of the sublattice states. A relationship between the sublattice method and the method of an extended unit cell is established.
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