Impurity modes in the one-dimensional XXZ Heisenberg model

被引：3
|
作者：
Sousa, J. M. [1 ]
Leite, R. V. [2 ]
Landim, R. R. [3 ]
Costa Filho, R. N. [3 ]
机构：
[1] Univ Fed Piaui, Dept Fis, BR-57072970 Teresina, Piaui, Brazil
[2] Univ Estadual Vale Acarau, Ctr Ciencias Exatas & Tecnol, Curso Fis, BR-62040730 Sobral, Ceara, Brazil
[3] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil
来源：
PHYSICA B-CONDENSED MATTER | 2014年 / 438卷
关键词：
XXZ model; Ising ferromagnet; Green's function; Spin wave; Impurities modes; GREEN-FUNCTION THEORY; LOCALIZED MAGNETIC EXCITATIONS; TRANSVERSE ISING FERROMAGNET; SPIN CORRELATION-FUNCTIONS; SURFACE; LAYER; STATES; FILM;
D O I：
10.1016/j.physb.2014.01.004
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A Green's function formalism is used to calculate the energy of impurity modes associated with one and/or two magnetic impurities in the one-dimensional Heisenberg XXZ magnetic chain. The system can be tuned from the Heisenberg to the Ising model varying a parameter lambda. A numerical study is performed showing two types of localized modes (s and p). The modes depend on lambda and the degeneracy of the acoustic modes is broken. (C) 2014 Elsevier B.V. All rights reserved.
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页码：78 / 83
页数：6
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