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Coherent potential approximation

About: Coherent potential approximation is a research topic. Over the lifetime, 1930 publications have been published within this topic receiving 36805 citations.


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TL;DR: In this article, a coherent potential approximation (CPA) within full counting statistics (FCS) formalism is shown to be a suitable method to investigate average electric conductance, shot noise as well as higher order cumulants in disordered systems.
Abstract: The coherent potential approximation (CPA) within full counting statistics (FCS) formalism is shown to be a suitable method to investigate average electric conductance, shot noise as well as higher order cumulants in disordered systems. We develop a similar FCS-CPA formalism for phonon transport through disordered systems. As a byproduct, we derive relations among coefficients of different phonon current cumulants. We apply the FCS-CPA method to investigate phonon transport properties of graphene systems in the presence of disorders. For binary disorders as well as Anderson disorders, we calculate up to the 8-th phonon transmission moments and demonstrate that the numerical results of the FCS-CPA method agree very well with that of the brute force method. The benchmark shows that the FCS-CPA method achieves 20 times more speedup ratio. Collective features of phonon current cumulants are also revealed.

2 citations

Journal ArticleDOI
TL;DR: In this article, the propagation of acoustic and elastic waves in random composites consisting of spherical inclusions in a homogeneous elastic host (fluid or solid), using various extensions of the Coherent Potential Approximation (CPA) method, was studied.
Abstract: We study the propagation of acoustic and elastic waves in random composites consisting of spherical inclusions in a homogeneous elastic host (fluid or solid), using various extensions of the Coherent Potential Approximation (CPA) method, well-known from the electronic problem. We calculate the phase velocity, the scattering mean free path and the transport velocity. The results are compared with experimental data and accurate computational results.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the dispersion relations and phonon linewidths of Ni0.89Cr0.11 have been determined for a model containing both types of disorder in this alloy.
Abstract: The authors present the results of an experiment in which the dispersion relations and phonon linewidths have been determined for the alloy Ni0.89Cr0.11. In this alloy the mass disorder is expected to produce negligible effects, whereas the disorder caused by force constants is expected to give some broadening of the phonon peaks. The results of a coherent potential approximation (CPA) calculation for a model containing both types of disorder in this alloy are also given. The experiment shows appreciable broadening which is somewhat larger than the calculated one.

2 citations

Proceedings ArticleDOI
01 Oct 2014
TL;DR: In this paper, a self-interaction-corrected local density-approximation (SIC-LDA) exchange correlation potential is employed for calculating the energy band gap and electronic structure of Cu 2 ZnSnSe 4 and CZS 4 based solar cells systems.
Abstract: First-principles calculations of the electronic and optical properties of Cu 2 ZnSnSe 4 (CZTSe) and Cu 2 ZnSnS 4 (CZTS) are simulated within the framework of the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) a sufficiently adequate approach, namely self-interaction-corrected local-density-approximation (SIC-LDA) exchange correlation potential is employed for calculating the energy band gap and electronic structure of Cu 2 ZnSnSe 4 and Cu 2 ZnSnS 4 based solar cells systems. This work presents detailed information about total and atom projected density of states functions, for different atoms in Cu 2 ZnSnSe 4 and Cu 2 ZnSnS 4 . We show that density functional theory is a very powerful tool for: studying the local doping effects, defects effect, size and disorder effect on optical and electronic properties of these materials, and predicting properties of new materials.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the composition dependence of the order-disorder critical temperature using the coherent potential approximation in the virtual crystal limit, which can explain the shift of the peak in the plot of the transition temperature against the composition.
Abstract: The composition dependence of the order-disorder critical temperature is investigated using the coherent potential approximation in the virtual crystal limit This simple band model allows the authors to explain the shift of the peak in the plot of the transition temperature against the composition to about 479 at% cobalt from the 50 at% predicted by the usual Bragg-Williams theory

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202222
202127
202030
201930
201840