Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder
Using the coherent potential approximation, we investigate the effects of disorder on the optical absorption and the density of states of Frenkel exciton systems on square, rectangular, and triangular lattices with nearest-neighbor interactions and a Gaussian distribution of transition energies. The...
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| Format: | Article |
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Wiley
2017-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2017/3836204 |
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| _version_ | 1832563198524391424 |
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| author | Ibrahim Avgin David Huber |
| author_facet | Ibrahim Avgin David Huber |
| author_sort | Ibrahim Avgin |
| collection | DOAJ |
| description | Using the coherent potential approximation, we investigate the effects of disorder on the optical absorption and the density of states of Frenkel exciton systems on square, rectangular, and triangular lattices with nearest-neighbor interactions and a Gaussian distribution of transition energies. The analysis is based on an elliptic integral approach that gives results over the entire spectrum. The results for the square lattice are in good agreement with the finite-array calculations of Schreiber and Toyozawa. Our findings suggest that the coherent potential approximation can be useful in interpreting the optical properties of two-dimensional systems with dominant nearest-neighbor interactions and Gaussian diagonal disorder provided the optically active states are Frenkel excitons. |
| format | Article |
| id | doaj-art-097f16a0f2b643b590fc78acee98534c |
| institution | Kabale University |
| issn | 1687-8108 1687-8124 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Condensed Matter Physics |
| spelling | doaj-art-097f16a0f2b643b590fc78acee98534c2025-02-03T01:20:44ZengWileyAdvances in Condensed Matter Physics1687-81081687-81242017-01-01201710.1155/2017/38362043836204Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal DisorderIbrahim Avgin0David Huber1Department of Electrical and Electronic Engineering, Ege University, Bornova, 3500 Izmir, TurkeyPhysics Department, University of Wisconsin-Madison, Madison, WI 53706, USAUsing the coherent potential approximation, we investigate the effects of disorder on the optical absorption and the density of states of Frenkel exciton systems on square, rectangular, and triangular lattices with nearest-neighbor interactions and a Gaussian distribution of transition energies. The analysis is based on an elliptic integral approach that gives results over the entire spectrum. The results for the square lattice are in good agreement with the finite-array calculations of Schreiber and Toyozawa. Our findings suggest that the coherent potential approximation can be useful in interpreting the optical properties of two-dimensional systems with dominant nearest-neighbor interactions and Gaussian diagonal disorder provided the optically active states are Frenkel excitons.http://dx.doi.org/10.1155/2017/3836204 |
| spellingShingle | Ibrahim Avgin David Huber Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder Advances in Condensed Matter Physics |
| title | Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder |
| title_full | Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder |
| title_fullStr | Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder |
| title_full_unstemmed | Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder |
| title_short | Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder |
| title_sort | absorption spectrum and density of states of square rectangular and triangular frenkel exciton systems with gaussian diagonal disorder |
| url | http://dx.doi.org/10.1155/2017/3836204 |
| work_keys_str_mv | AT ibrahimavgin absorptionspectrumanddensityofstatesofsquarerectangularandtriangularfrenkelexcitonsystemswithgaussiandiagonaldisorder AT davidhuber absorptionspectrumanddensityofstatesofsquarerectangularandtriangularfrenkelexcitonsystemswithgaussiandiagonaldisorder |