Two-site reduced density matrix from one- and two-particle Green's functions

被引：2

作者：

Roosz, Gergo ^{[1
]}

Kauch, Anna ^{[2
]}

Bippus, Frederic ^{[2
]}

Wieser, Daniel ^{[2
]}

Held, Karsten ^{[2
]}

机构：

[1] HUN REN Wigner Res Ctr Phys, POB 49, H-1525 Budapest, Hungary

[2] TU Wien, Inst Solid State Phys, A-1040 Vienna, Austria

来源：

PHYSICAL REVIEW B | 2024年 / 110卷 / 07期

基金：

奥地利科学基金会;

关键词：

ENTANGLEMENT; ENTROPY;

D O I：

10.1103/PhysRevB.110.075115

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Strongly correlated electron systems are challenging to calculate, and entanglement in such systems is not widely analyzed. We present an approach that can be used as a postprocessing step for calculating the two-site reduced density matrix and from it entanglement measures such as the mutual information and entanglement negativity. Input is only the one- and two-particle Green's function, which is the output of numerous many-body methods. As an illustration, we present results for a toy model, the Hubbard model on a 2 x 2 cluster and a six-site ring.

引用

页数：19

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