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