Solving the Multi-site and Multi-orbital Dynamical Mean Field Theory Using Density Matrix Renormalization

Frontiers in Physics

Nú¹  ez Ferná¹  ndez, Yuriel²  ñ² 

[1] Centro Atómico Bariloche and Instituto Balseiro, CNEA, CONICET, Argentina

关键词: Density matrix renormalization group;    Dynamical mean field theory;    correlated electrons;    Density of States;    Multi-orbital models;   

DOI  :  10.3389/fphy.2018.00013

学科分类：物理（综合）

来源: Frontiers

【 摘 要 】

We implement an efficient numerical method to calculate response functions of complex impurities based on the Density Matrix Renormalization Group (DMRG) and use it as the impurity-solver of the Dynamical Mean Field Theory (DMFT). This method uses the correction vector to obtain precise Green's functions on the real frequency axis at zero temperature. By using a self-consistent bath configuration with very low entanglement, we take full advantage of the DMRG to calculate dynamical response functions paving the way to treat large effective impurities such as those corresponding to multi-orbital interacting models and multi-site or multi-momenta clusters. This method leads to reliable calculations of non-local self energies at arbitrary dopings and interactions and at any energy scale.

【 授权许可】

CC BY