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.

Matthes, L., Pulci, O., Bechstedt, F. (2013). Massive Dirac quasiparticles in the optical absorbance of graphene, silicene, germanene, and tinene. JOURNAL OF PHYSICS. CONDENSED MATTER, 25(39) [10.1088/0953-8984/25/39/395305].

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

PULCI, OLIVIA;
2013-01-01

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.
2013
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
Matthes, L., Pulci, O., Bechstedt, F. (2013). Massive Dirac quasiparticles in the optical absorbance of graphene, silicene, germanene, and tinene. JOURNAL OF PHYSICS. CONDENSED MATTER, 25(39) [10.1088/0953-8984/25/39/395305].
Matthes, L; Pulci, O; Bechstedt, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/104735
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