In solid-state physics, the k·p perturbation theory is an approximated semi-empirical approach for calculating the band structure (particularly effective...

Møller–Plesset perturbation theory (MP) is one of several quantum chemistry post-Hartree–Fock ab initio methods in the field of computational chemistry...

Frontier molecular orbital theory Ligand field theory (MO theory for transition metal complexes) Møller–Plesset perturbation theory Quantum chemistry computer...

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...

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...

E k 1 n E k 2 k 3 2 E k 2 k 4 − V k 2 k 3 V k 3 k 4 V k 4 n V k 1 k 2 E k 1 n E k 2 n E n k 3 E n k 4 + V k 1 k 2 E k 1 n ( | V k 2 k 3 | 2 V k 2 k 2...

In mathematics, variational perturbation theory (VPT) is a mathematical method to convert divergent power series in a small expansion parameter, say s...

function. One of these approaches, Møller–Plesset perturbation theory, treats correlation as a perturbation of the Fock operator. Others expand the true multi-electron...

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...

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...

cosmological perturbation theory is the theory by which the evolution of structure is understood in the Big Bang model. Cosmological perturbation theory may be...

panic, a computer stopping in response to an unrecoverable error k·p perturbation theory, for calculating properties of crystalline solids KP, a recording...

electron-hole pairs) and the Sternheimer equation (density-functional perturbation theory). Hohenberg, P.; Kohn, W. (1964). "Inhomogeneous Electron Gas". Physical...

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...

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...

degenerate perturbation theory, respectively, can be applied in these two cases to solve for the Fourier coefficients C k {\displaystyle C_{\mathbf {k} }} of...

In mathematics, an eigenvalue perturbation problem is that of finding the eigenvectors and eigenvalues of a system A x = λ x {\displaystyle Ax=\lambda...

represented by a Feynman diagram according to perturbation theory in quantum mechanics. Quantum field theory emerged from the work of generations of theoretical...

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...

In mathematics and electronics, cavity perturbation theory describes methods for derivation of perturbation formulae for performance changes of a cavity...

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 ) ]...

theory — Perturbation theory — Potential theory — Probability theory — Ramsey theory — Rational choice theory — Representation theory — Ring theory —...

Hamiltonian is generally derived using a combination of the k·p perturbation theory alongside the Kane model. Fine electronic structure Electric dipole...

 Čížek used the correlation function of MET and used Goldstone-type perturbation theory to get the energy expression, while original MET was completely variational...

approach, interactions between different atomic sites are considered as perturbations. There exist several kinds of interactions we must consider. The crystal...

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...

configuration interaction (MRCI) or multi-reference perturbation theories like complete active space perturbation theory (CASPT2). These methods can deal with extremely...

standard way to derive the equation is to start with time-dependent perturbation theory and to take the limit for absorption under the assumption that the...

Wiley, Chichester, (2002), pg 126–131 J. J. P. Stewart, Reviews in Computational Chemistry, Volume 1, Eds. K. B. Lipkowitz and D. B. Boyd, VCH, New York...

Complete active space perturbation theory (CASPTn) is a multireference electron correlation method for computational investigation of molecular systems...