Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 139, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4824078
Keywords
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Funding
- National Basic Research Program of China (973 program) [2013CB632401]
- National Natural Science Foundation of China [11374190, 21333006, 11174180]
- Fund for Doctoral Program of National Education [20120131110066]
- Natural Science Foundation of Shandong Province [ZR2011AM009]
- Deutsche Forschungsgemeinschaft (DFG) [SPP-1613]
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In order to study many-body effects in ZnO structures with reduced-dimensionality, electronic and optical absorption properties of ZnO monolayer and armchair ZnO nanoribbons (AZnONRs) are studied by means of Green's function perturbation theory using the GW+Bethe-Salpeter equation approach. In both ZnO monolayer and AZnONRs, as a consequence of enhanced quantum confinement, the quasi-particle corrections are significant and the optical absorption properties are dominated by strong excitonic effects with considerable binding energies (1-2 eV) assigned to the lowest-energy bound excitons. It reveals that inclusion of excitonic effects, which are neglected in calculations at single-particle approximation, is crucial to qualitatively and quantitatively describe the optical properties of such materials with reduced-dimensionality. (C) 2013 AIP Publishing LLC.
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