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Volumn 131, Issue 15, 2009, Pages

The self-energy beyond GW: Local and nonlocal vertex corrections

Author keywords

[No Author keywords available]

Indexed keywords

CHARGE SCREENING; CONDUCTION STATE; CORRELATED SYSTEMS; ELECTRON SELF-ENERGY; GW APPROXIMATION; NONLOCAL; SELF ENERGY; STRONGLY CORRELATED MATERIALS; THREE-POINT FUNCTION; TIME DEPENDENT DENSITY FUNCTIONAL THEORY; TWO-POINT; VERTEX CORRECTION;

EID: 70449428121     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.3249965     Document Type: Article
Times cited : (134)

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    • We stress here that the electron-electron interaction U is spin independent, contrary to Uσ σ′ =U (1- δσ σ′), which is often used in the Hubbard model (Refs.). The constant U in Eq. corresponds to the localized limit of the many-body Hamiltonian as it is used in MBPT, hence it better reflects the approximations we want to examine. When acting on a Slater determinant, both choices yield the same result. This is not the case when the Hamiltonian acts on a generic state which is not antisymmetric. In this case, the spin-dependent interaction itself would take into account the Pauli principle, hence exchange-induced corrections.
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    • We choose the following convention as fermionic ordering: 〉 = c 2 c 1 c 1 00 〉
    • We choose the following convention as fermionic ordering: 〉 = c 2 c 1 c 1 00 〉.
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    • In order to lift the degeneracy between the states 〉 and 〉 we can apply a magnetic field which stabilizes, for example, the state 〉
    • In order to lift the degeneracy between the states 〉 and 〉 we can apply a magnetic field which stabilizes, for example, the state 〉.


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