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LDA+ Σ ( ω ) Method for the Electronic Structure of Strongly Correlated Antiferromagnetic Materials: Application to La 2 CuO 4
Author(s) -
PérezNavarro A.,
CostaQuintana J.,
LópezAguilar F.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200209)233:2<286::aid-pssb286>3.0.co;2-2
Subject(s) - antiferromagnetism , electronic structure , ground state , local density approximation , condensed matter physics , density of states , physics , strongly correlated material , spin density , statistical physics , quantum mechanics , electron
In this paper we present a method for obtaining the quasiband structure and the renormalized density of quasistates of strongly correlated systems with antiferromagnetic ordering. We calculate the electronic structure of La 2 CuO 4 in order to test this method. The first step required is to calculate the electronic structure from the local density approximation (LDA) in order to obtain the initial non‐interacting ground state. The LDA density of states in strongly correlated systems usually presents serious discrepancies with experimental results. As is well known, these discrepancies, fundamentally concerning photoemission, are due to the fact that the dynamic correlation effects are not taken into account within the LDA. In order to include these effects, we obtain a self‐energy potential which allows the initial LDA electronic structure to connect with that of the antiferromagnetic ground state arising from a Bogolyubov‐like transformation. Within this new ground state, we determine an antiferromagnetic self‐energy by means of a spin density wave procedure, and the interacting Green function yields a density of states which is in reasonable agreement with the experimental photoemission result.