Fork Tensor-Product States: Efficient Multiorbital Real-Time DMFT Solver

被引:79
作者
Bauernfeind, Daniel [1 ]
Zingl, Manuel [1 ]
Triebl, Robert [1 ]
Aichhorn, Markus [1 ]
Evertz, Hans Gerd [1 ,2 ]
机构
[1] Graz Univ Technol, Inst Theoret & Computat Phys, A-8010 Graz, Austria
[2] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA
基金
美国国家科学基金会; 奥地利科学基金会;
关键词
MATRIX RENORMALIZATION-GROUP; MEAN-FIELD THEORY; FERMIONS;
D O I
10.1103/PhysRevX.7.031013
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present a tensor network especially suited for multi-orbital Anderson impurity models and as an impurity solver for multi-orbital dynamical mean-field theory (DMFT). The solver works directly on the real-frequency axis and yields high spectral resolution at all frequencies. We use a large number (O(100)) of bath sites and therefore achieve an accurate representation of the bath. The solver can treat full rotationally invariant interactions with reasonable numerical effort. We show the efficiency and accuracy of the method by a benchmark for the three-orbital test-bed material SrVO3. There we observe multiplet structures in the high-energy spectrum, which are almost impossible to resolve by other multi-orbital methods. The resulting structure of the Hubbard bands can be described as a broadened atomic spectrum with rescaled interaction parameters. Additional features emerge when U is increased. Finally, we show that our solver can be applied even to models with five orbitals. This impurity solver offers a new route to the calculation of precise real-frequency spectral functions of correlated materials.
引用
收藏
页数:15
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