In solid-state physics, the k·p perturbation theory is an approximated semi-empirical approach for calculating the band structure (particularly effective...
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Møller–Plesset perturbation theory (MP) is one of several quantum chemistry post-Hartree–Fock ab initio methods in the field of computational chemistry...
23 KB (2,870 words) - 20:17, 25 November 2023
Frontier molecular orbital theory Ligand field theory (MO theory for transition metal complexes) Møller–Plesset perturbation theory Quantum chemistry computer...
22 KB (2,943 words) - 17:32, 23 June 2024
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated...
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Electronic band structure (redirect from Band theory)
of a region of free space that has been divided into a lattice. k·p perturbation theory is a technique that allows a band structure to be approximately...
36 KB (4,771 words) - 12:33, 19 July 2024
Schrieffer and P.A. Wolff., Joaquin Mazdak Luttinger and Walter Kohn used this method in an earlier work about non-periodic k·p perturbation theory. Using the...
12 KB (2,124 words) - 12:20, 10 June 2024
Hartree–Fock method (redirect from Hartree-Fock theory)
function. One of these approaches, Møller–Plesset perturbation theory, treats correlation as a perturbation of the Fock operator. Others expand the true multi-electron...
31 KB (4,729 words) - 12:30, 5 August 2024
In chemistry, valence bond (VB) theory is one of the two basic theories, along with molecular orbital (MO) theory, that were developed to use the methods...
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density contributes a term in the gradient of the density. In a perturbation theory approach the direct correlation function is given by the sum of the...
79 KB (10,545 words) - 03:52, 13 August 2024
electron-hole pairs) and the Sternheimer equation (density-functional perturbation theory). Hohenberg, P.; Kohn, W. (1964). "Inhomogeneous Electron Gas". Physical...
16 KB (2,495 words) - 21:24, 30 October 2023
In mathematics, variational perturbation theory (VPT) is a mathematical method to convert divergent power series in a small expansion parameter, say s...
4 KB (428 words) - 13:36, 16 December 2020
cosmological perturbation theory is the theory by which the evolution of structure is understood in the Big Bang model. Cosmological perturbation theory may be...
15 KB (2,050 words) - 13:23, 28 October 2023
The Luttinger–Kohn model is a flavor of the k·p perturbation theory used for calculating the structure of multiple, degenerate electronic bands in bulk...
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the theory of semiconductors that are now used in consumer and other electronics. He was one of the main developers of the k·p perturbation theory which...
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degenerate perturbation theory, respectively, can be applied in these two cases to solve for the Fourier coefficients C k {\displaystyle C_{\mathbf {k} }} of...
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represented by a Feynman diagram according to perturbation theory in quantum mechanics. Quantum field theory emerged from the work of generations of theoretical...
106 KB (14,897 words) - 08:50, 30 July 2024
In mathematics, an eigenvalue perturbation problem is that of finding the eigenvectors and eigenvalues of a system A x = λ x {\displaystyle Ax=\lambda...
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Fermi's golden rule (category Perturbation theory)
result of a weak perturbation. This transition rate is effectively independent of time (so long as the strength of the perturbation is independent of...
31 KB (3,936 words) - 02:26, 14 August 2024
Thomas–Fermi model (redirect from Thomas-Fermi theory)
atom is t ( r ) = ∫ p 2 2 m e n ( r ) F r ( p ) d p = n ( r ) ∫ 0 p f ( r ) p 2 2 m e 4 π p 2 4 3 π p F 3 ( r ) d p = C k i n [ n ( r ) ]...
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In mathematics and electronics, cavity perturbation theory describes methods for derivation of perturbation formulae for performance changes of a cavity...
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are lower order terms of the Luttinger–Kohn k·p perturbation theory in powers of k {\displaystyle k} . Next terms of this expansion also produce terms...
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theory — Perturbation theory — Potential theory — Probability theory — Ramsey theory — Rational choice theory — Representation theory — Ring theory —...
38 KB (4,356 words) - 13:30, 30 July 2024
Čížek used the correlation function of MET and used Goldstone-type perturbation theory to get the energy expression, while original MET was completely variational...
28 KB (4,353 words) - 18:46, 19 July 2024
Complete active space perturbation theory (CASPTn) is a multireference electron correlation method for computational investigation of molecular systems...
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straightforwardly defined using the techniques of perturbation theory, but it is not known in general how to define string theory nonperturbatively. It is also not clear...
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approach, interactions between different atomic sites are considered as perturbations. There exist several kinds of interactions we must consider. The crystal...
34 KB (7,311 words) - 20:02, 6 February 2024
Stark effect (section Perturbation theory)
effect is described by second-order perturbation theory. The zeroth-order eigenproblem H ( 0 ) ψ k 0 = E k ( 0 ) ψ k 0 , k = 0 , 1 , … , E 0 ( 0 ) < E 1 (...
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use of group theory and in particular Bloch's theorem, which leads to the result that the energy eigenvalues depend on the crystal momentum k {\displaystyle...
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Hamiltonian is generally derived using a combination of the k·p perturbation theory alongside the Kane model. Fine electronic structure Electric dipole...
5 KB (753 words) - 01:09, 17 June 2023