A Fast Impurity Solver Based on Gutzwiller variational approach
arXiv:0810.2385 · doi:10.1103/PhysRevB.79.165114
Abstract
A fast impurity solver for the dynamical mean field theory(DMFT) named Two Mode Approxi- mation (TMA) is proposed based on the Gutzwiller variational approach, which captures the main features of both the coherent and incoherent motion of the electrons. The new solver works with real frequency at zero temperature and it provides directly the spectral function of the electrons. It can be easily generalized to multi-orbital impurity problems with general on-site interactions, which makes it very useful in LDA+DMFT. Benchmarks on one and two band Hubbard models are presented, and the results agree well with those of Exact Diagonalization (ED).
29 pages, 14 figures
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- Zero temperature dynamics of the Hubbard model in infinite dimensions: A local moment approach
- Second-order dual fermion for multi-orbital systems
- A Standard Basis Operator Equation of Motion Impurity Solver for Dynamical Mean Field Theory
- Fast multi-orbital equation of motion impurity solver for dynamical mean field theory
- Constructive Fermionic Matrix Product States for Projected Fermi Sea