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Massive Dirac quasiparticles in the optical absorbance of graphene, silicene, germanene, and tinene.

Authors :
Matthes L
Pulci O
Bechstedt F
Source :
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2013 Oct 02; Vol. 25 (39), pp. 395305. Date of Electronic Publication: 2013 Sep 04.
Publication Year :
2013

Abstract

We present first-principles studies of the optical absorbance of the group IV honeycomb crystals graphene, silicene, germanene, and tinene. We account for many-body effects on the optical properties by using the non-local hybrid functional HSE06. The optical absorption peaks are blueshifted due to quasiparticle corrections, while the influence on the low-frequency absorbance remains unchanged and reduces to a universal value related to the Sommerfeld fine structure constant. At the Dirac points spin-orbit interaction opens fundamental band gaps; parabolic bands with a very small effective mass emerge. Consequently, the low-frequency absorbance is modified with a spin-orbit-induced transparency region and an increase of the absorbance at the fundamental absorption edge.

Details

Language :
English
ISSN :
1361-648X
Volume :
25
Issue :
39
Database :
MEDLINE
Journal :
Journal of physics. Condensed matter : an Institute of Physics journal
Publication Type :
Academic Journal
Accession number :
24002054
Full Text :
https://doi.org/10.1088/0953-8984/25/39/395305