A standard basis operator equation of motion impurity solver for dynamical mean field theory

Hengyue Li and Ning-Hua Tong ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2015, vol. 88, issue 12, 1-11

Abstract: We present an efficient impurity solver for the dynamical mean-field theory (DMFT). It is based on the separation of bath degrees of freedom into the low energy and the high energy parts. The former is solved exactly using exact diagonalization and the latter is treated approximately using Green’s function equation of motion decoupling approximation. The two parts are combined coherently under the standard basis operator formalism. The impurity solver is applied to the Anderson impurity model and, combined with DMFT, to the one-band Hubbard model. Qualitative agreement is found with other well established methods. Some promising features and possible improvements of the present solver are discussed. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Keywords: Computational Methods (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1140/epjb/e2015-60082-9

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