Variational Model for Low-Dimensional Magnets

被引：0
|
作者：
Kudasov, Yu. B. [1 ,2 ]
Kozabaranov, R. V. [1 ]
机构：
[1] Natl Res Nucl Univ Moscow Engn Phys Inst MEPhI, Sarov State Phys & Tech Inst, Sarov Branch, Sarov 607186, Russia
[2] All Russian Res Inst Expt Phys, Russian Fed Nucl Ctr, Sarov 607188, Russia
来源：
PHYSICS OF THE SOLID STATE | 2020年 / 62卷 / 09期
关键词：
one-dimensional quantum magnets; XXZchain in the alternating magnetic field; variational theory; Gutzwiller method; ground state; FIELD-INDUCED GAP; SPIN GAP; CHAIN;
D O I：
10.1134/S1063783420090176
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The method of nonlocal trial variation function for quantum one-dimensional systems is developed on an example of a spin-1/2XXZchain with an alternating magnetic field. A four-site trial wave function for a fermionic representation of the model is constructed. The results obtained using the model with the extended trial wave function show a considerable improvement of accuracy of the ground state energy calculation in the field of critical behavior in comparison with the solutions obtained earlier. The methods for calculating the experimentally observed spin correlation function are considered.
引用
收藏
页码：1678 / 1684
页数：7
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