Coherent potential approximation for the absorption spectra and the densities of states of cubic Frenkel exciton systems with Gaussian diagonal disorder

2015 ◽  
Vol 477 ◽  
pp. 83-86 ◽  
Author(s):  
I. Avgin ◽  
A. Boukahil ◽  
D.L. Huber
Keyword(s):  
Absorption Spectra ◽  
Coherent Potential Approximation ◽  
Frenkel Exciton ◽  
Potential Approximation ◽  
Densities Of States ◽  
Diagonal Disorder

scholarly journals Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Ibrahim Avgin ◽  
David Huber
Keyword(s):  
Density Of States ◽  
Nearest Neighbor ◽  
Elliptic Integral ◽  
Coherent Potential Approximation ◽  
Square Lattice ◽  
Integral Approach ◽  
Frenkel Exciton ◽  
Potential Approximation ◽  
Effects Of Disorder ◽  
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 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.

Tight-binding coherent-potential approximation including off-diagonal disorder

1989 ◽  
Vol 40 (18) ◽  
pp. 12196-12200 ◽  
Author(s):  
D. A. Papaconstantopoulos ◽  
A. Gonis ◽  
P. M. Laufer
Keyword(s):  
Tight Binding ◽  
Coherent Potential Approximation ◽  
Potential Approximation ◽  
Diagonal Disorder

Coherent potential approximation for the absorption spectra of a two-dimensional Frenkel exciton system with Gaussian diagonal disorder

2014 ◽  
Vol 28 (32) ◽  
pp. 1450251 ◽  
Author(s):  
A. Boukahil ◽  
D. L. Huber
Keyword(s):  
Density Of States ◽  
Reasonable Agreement ◽  
Nearest Neighbor ◽  
Square Lattice ◽  
Two Dimensional ◽  
Frenkel Exciton ◽  
Potential Approximation ◽  
Urbach Tail ◽  
Diagonal Disorder ◽  
Exciton System

We investigate the optical absorption and the density of states of a Frenkel exciton system on a square lattice with nearest-neighbor interactions and a Gaussian distribution of transition frequencies (i.e. Gaussian diagonal disorder). Results are presented for the absorption and the density of states of direct and indirect edge systems for a range of variances. There is reasonable agreement with the corresponding finite array calculations of Schreiber and Toyozawa. The existence of an Urbach tail is also investigated.

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