Green function appears as a natural element in Feynman diagram that represents a group of terms in many-body perturbation theory. The graphical method appeals to intuition, and is convenient to reorganize the perturbation series to infinite order. The discussion in this chapter is rather technical,...
In the spirit of the present treatment, we shall not address the most advanced problems of many-body perturbation theory (MBPT). Rather, the forthcoming chapter offers a simple introduction permitting one to pick up the basis ideas of MBPT. In particular, we shall derive the second-order ...
1) Perturbation theory One could do: Treat e-e interactions as 'weak', variational method. 2) Neglect interactions E.g. Semi-conductors/metals -Numerical approaches- The analytical approaches are based on neglecting some of the interactions that are weak. However, for the strongly correlated regi...
Many-body perturbation theory applied to dielectronic recombination resonances 来自 EBSCO 喜欢 0 阅读量: 26 作者: E Lindroth 摘要: A procedure to calculate dielectronic recombination cross-sections based on relativistic many-body perturbation in an all order formulation is presented. Complex rotation...
Molecular electronic-structure theory 2014, Molecular Electronic-Structure Theory Multireference perturbation theory for large restricted and selected active space reference wave functions 2000, Journal of Chemical Physics Third-order multireference perturbation theory The CASPT3 method 1996, Molecular Physics ...
Many-body perturbation theory using the density-functional concept: beyond the GW approximation We propose an alternative formulation of many-body perturbation theory that uses the density-functional concept. Instead of the usual four-point integral e... F Bruneval,F Sottile,V Olevano,... - 《...
The renormalization and regularization techniques provide a natural extension of various CC methods to ameliorate typical problems with the many-body perturbation theory associated with inadequate choice of the reference function in single-reference CC formulations or an inadequate choice of model space in...
In a typical scenario the diagrammatic many-body perturbation theory generates asymptotic series. Despite non-convergence, the asymptotic expansions are useful when truncated to a finite number of terms. This is the reason for the popularity of leading-order methods such as the GW approximation in ...
Study of the Nuclear Quadrupole Interaction in the Excited (23P) State of the Beryllium Atom by Many-Body Perturbation Theory The linked-cluster many-body perturbation theory with a ${V}^{\\\mathrm{N}\\\ensuremath{-}1}$ potential has been applied to study the nuclear quadrupole interaction...
1) many-body perturbation theory 多体微扰理论1. The equilibrium structure and intermolecular interaction potentials of water dimer have been calculated using supermolecular many-body perturbation theory at the second-order to fourth-order levels. 利用超分子二阶到四阶多体微扰理论和扩展的相关一致基组(...