Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 74, Issue -, Pages 377-381Publisher
ELSEVIER
DOI: 10.1016/j.physe.2015.07.030
Keywords
Germanene; Graphene; DFT calculations; GW approximations; Phonon; Dispersions; Band structure; Optical properties; Dielectric response; Binding energy
Funding
- CNRS
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Many body effects on the electronic and optical absorption properties of a GeC sheet are studied by means of first principle many-body Green's function and Bethe-Salpeter equation formalism. The absence of soft modes in the phonon-spectrum indicates the stability of the system. The inclusion of quasiparticle corrections increases significantly the band gap. The local field effects induce significant change in the absorption spectra for the out-plane polarization rendering the GeC monolayer transparent below 7 eV. The excitonic effects are significant on the optical absorption properties. A detailed analysis of the spectrum shows a strong binding energy of 1.82 eV assigned to the lowest-energy bound excitons that is characterized by an effective mass of 1.68m(0) and a Bohr radius of 2 A. The results of this study hold the promise for potential applications of he GeC hybrid in optoelectronics. (C) 2015 Elsevier B.V. All rights reserved.
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