Variational model for one-dimensional quantum magnets

被引：4
|
作者：
Kudasov, Yu. B. [1 ,2 ,3 ]
Kozabaranov, R. V. [1 ,2 ]
机构：
[1] NRNU MEPhI, Sarov Phys & Technol Inst, 6 Dukhov Str, Sarov 607186, Russia
[2] Natl Res Nucl Univ MEPhI, 31 Kashirskoe Ave, Moscow 115409, Russia
[3] Russian Fed Nucl Ctr VNIIEF, 37 Mira Ave, Sarov 607188, Russia
来源：
PHYSICS LETTERS A | 2018年 / 382卷 / 16期
关键词：
1D quantum magnet; Staggered magnetic field; Jordan-Wigner transformation; Trial wave function; Ground state energy; Correlation function; FIELD-INDUCED GAP; ANTIFERROMAGNETIC CHAINS; SPIN GAP; SYMMETRY;
D O I：
10.1016/j.physleta.2018.02.031
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A new variational technique for investigation of the ground state and correlation functions in ID quantum magnets is proposed. A spin Hamiltonian is reduced to a fermionic representation by the Jordan-Wigner transformation. The ground state is described by a new non-local trial wave function, and the total energy is calculated in an analytic form as a function of two variational parameters. This approach is demonstrated with an example of the XXZ-chain of spin-1/2 under a staggered magnetic field. Generalizations and applications of the variational technique for low-dimensional magnetic systems are discussed. (C) 2018 Elsevier B.V. All rights reserved.
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页码：1120 / 1123
页数：4
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