Modified group projectors: tight binding method

Details Modified group projectors: tight binding method Modified group projectors: tight binding method

2000-04-20

arxiv.org/abs/cond-mat/0004344v1

J. Phys. A 33 (2000) 6561-72

Physics

Condensed Matter

Soft Condensed Matter

10 pages 1 figure

Scientific paper

10.1088/0305-4470/33/37/308

Modified group projector technique for induced representations is a powerful tool for calculation and symmetry quantum numbers assignation of a tight binding Hamiltonian energy bands of crystals. Namely, the induced type structure of such a Hamiltonian enables efficient application of the procedure: only the interior representations of the orbit stabilizers are to be considered. Then the generalized Bloch eigen functions are obtained naturally by the expansion to the whole state space. The method is applied to the electronic pi-bands of the single wall carbon nanotubes: together with dispersion relations, their complete symmetry assignation by the full symmetry (line) groups and the corresponding symmetry-adapted eigen function are found.

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