Category:Constrained-random-phase approximation: Difference between revisions
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The '''constrained random-phase approximation''' ( | The '''constrained random-phase approximation''' (cRPA) is a method that allows the calculation of the effective interaction parameter <math>U</math>, <math>J</math>, and <math>J'</math> for model Hamiltonians. | ||
The main idea is to neglect the screening effects of specific | The main idea is to neglect the screening effects of specific target states in the screened Coulomb interaction <math>W</math> of the [[The GW approximation of Hedin's equations|GW method]]. | ||
The resulting partially screened Coulomb interaction is evaluated in a [[Wannier functions|localized basis]] that spans the target space and is described by the model Hamiltonian. | The resulting partially screened Coulomb interaction is evaluated in a [[Wannier functions|localized basis]] that spans the target space and is described by the model Hamiltonian. | ||
The target space is usually low-dimensional and therefore allows for the application of a higher-level theory, such as dynamical-mean-field theory (DMFT). | The target space is usually low-dimensional and therefore allows for the application of a higher-level theory, such as dynamical-mean-field theory (DMFT). | ||
More information about | More information about cRPA is found on the following page: | ||
[[Constrained–random- | [[Constrained–random-phase–approximation formalism]] | ||
[[Category:VASP|ACFDT]][[Category:Many-body perturbation theory | [[Category:VASP|ACFDT]][[Category:Many-body perturbation theory]] | ||
Latest revision as of 13:44, 4 April 2025
The constrained random-phase approximation (cRPA) is a method that allows the calculation of the effective interaction parameter [math]\displaystyle{ U }[/math], [math]\displaystyle{ J }[/math], and [math]\displaystyle{ J' }[/math] for model Hamiltonians. The main idea is to neglect the screening effects of specific target states in the screened Coulomb interaction [math]\displaystyle{ W }[/math] of the GW method. The resulting partially screened Coulomb interaction is evaluated in a localized basis that spans the target space and is described by the model Hamiltonian. The target space is usually low-dimensional and therefore allows for the application of a higher-level theory, such as dynamical-mean-field theory (DMFT).
More information about cRPA is found on the following page:
Pages in category "Constrained-random-phase approximation"
The following 21 pages are in this category, out of 21 total.