The two-time Green's function and the diagram technique

被引：14

作者：

Plakida, N. M. ^{[1
]}

机构：

[1] Joint Inst Nucl Res, Dubna, Moscow Oblast, Russia

来源：

THEORETICAL AND MATHEMATICAL PHYSICS | 2011年 / 168卷 / 03期

关键词：

dynamical spin susceptibility; Heisenberg model; retarded Green's function; advanced Green's function; Tyablikov decoupling; diagram technique for spin Green's functions; 2-DIMENSIONAL HEISENBERG-MODEL; SHORT-RANGE ORDER; T-J MODEL; HUBBARD-MODEL; SPIN-WAVE; EQUATIONS; FERROMAGNET; MOTION;

D O I：

10.1007/s11232-011-0107-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Based on constructing the equations of motion for the two-time Green's functions, we discuss calculating the dynamical spin susceptibility and correlation functions in the Heisenberg model. Using a Mori-type projection, we derive an exact Dyson equation with the self-energy operator in the form of a multiparticle Green's function. Calculating the self-energy operator in the mode-coupling approximation in the ferromagnetic phase, we reproduce the results of the temperature diagram technique, including the correct formula for low-temperature magnetization. We also consider calculating the spin fluctuation spectrum in the paramagnetic phase in the framework of the method of equations of motion for the relaxation function.

引用

页码：1303 / 1317

页数：15

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