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Excitons in two‐dimensional sheets with honeycomb symmetry
Author(s) -
Pulci O.,
Marsili M.,
Garbuio V.,
Gori P.,
Kupchak I.,
Bechstedt F.
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201350404
Subject(s) - exciton , symmetry (geometry) , ab initio , radius , physics , basis (linear algebra) , binding energy , class (philosophy) , statistical physics , theoretical physics , molecular physics , quantum mechanics , mathematics , computer science , geometry , computer security , artificial intelligence
In this paper, we present results concerning ab initio calculations of the optical properties of group IV two‐dimensional sheets and compare them with the prediction of an analytical model for excitons in two dimensions, which we explicitly derive. This comparison helps to understand the physics at the basis of the strong many‐body effects present in the optical spectra of this class of materials. Although it demonstrates the need of full ab initio calculations for an accurate description of the two‐dimensional excitons, it validates, at the same time, this simple approach to estimate, through a density functional theory calculation of the two‐dimensional electronic and optical properties, the binding energy and the radius of the excitons in this class of materials.