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

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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.

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Authors and Affiliations

  1. Department of Physics, Renmin University of China, Beijing, 100872, P.R. China

    Hengyue Li & Ning-Hua Tong

  2. Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing, 100872, P.R. China

    Hengyue Li & Ning-Hua Tong

Authors
  1. Hengyue Li
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  2. Ning-Hua Tong
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Correspondence to Ning-Hua Tong.

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Li, H., Tong, NH. A standard basis operator equation of motion impurity solver for dynamical mean field theory. Eur. Phys. J. B 88, 319 (2015). https://doi.org/10.1140/epjb/e2015-60082-9

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  • DOI: https://doi.org/10.1140/epjb/e2015-60082-9

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