Journal
PHYSICAL REVIEW B
Volume 79, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.075114
Keywords
ab initio calculations; density functional theory; SCF calculations; strongly correlated electron systems; variational techniques
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We report in detail our ab initio local density approximation (LDA)+Gutzwiller method, in which the Gutzwiller variational approach is naturally incorporated with the density-functional theory through the Gutzwiller density-functional theory (which is a generalization of original Kohn-Sham formalism). This method can be used for ground-state determination of electron systems ranging from weakly correlated metal to strongly correlated insulators with long-range ordering. We will show that its quality for ground state is as high as that by dynamic mean-field theory, and yet it is computationally much cheaper. In addition, the method is fully variational, the charge-density self-consistency can be naturally achieved, and the quantities, such as total energy and linear response, can be accurately obtained similarly as with LDA-type calculations. Applications on several typical systems are presented, and the characteristic aspects of this method are clarified. The obtained results using LDA+Gutzwiller are in better agreement with existing experiments, suggesting significant improvements over LDA or LDA+U.
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