Choice of the unit cell, selection rules, and optical matrix elements: a tight-binding study of graphene nanoribbons

Details Choice of the unit cell, selection rules, and optical matrix elements: a tight-binding study of graphene nanoribbons Choice of the unit cell, selection rules, and optical matrix elements: a tight-binding study of graphene nanoribbons

2010-07-07

arxiv.org/abs/1007.1106v3

Physica B 406, 3538 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 6 figures (included)

Scientific paper

10.1016/j.physb.2011.06.008

In this work we argue that it is important to make a proper choice of the unit cell within tight-binding theory if one aims to compute the optical matrix elements. By considering zigzag graphene nanoribbons, we demonstrate that the band structure is insensitive to the choice of the unit cell. However, if the chosen unit cell does not incorporate the symmetries of the system, wrong values of optical matrix elements are obtained, leading to the violation of well-known selection rules. This result holds irrespective of the formalism utilized for calculating the optical matrix elements.

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