Size-dependent magnon modes of a Heisenberg ferromagnet

被引：4
|
作者：
Cojocaru, S
Ceulemans, A
机构：
[1] Univ Louvain, Div Quantum Chem, B-3001 Louvain, Belgium
[2] Inst Appl Phys, Kishinev, Moldova
来源：
EUROPHYSICS LETTERS | 2003年 / 61卷 / 06期
关键词：
D O I：
10.1209/epl/i2003-00310-1
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We prove the existence of new bound magnon excitations in Heisenberg ferromagnets due to finite-size effects. To describe these effects, we develop an analytical approximation which is a modification of the widely used continuum approach. Thus, for the square lattice we find 4 branches of bound two-magnon excitations in addition to the two ones known before. It is shown that some of the new modes remain well separated from all the others even for a macroscopic system.
引用
收藏
页码：838 / 844
页数：7
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