Impurity modes in the one-dimensional XXZ Heisenberg model
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- 作者：J.M. Sousa ; R.V. Leite ; R.R. L ; im ; R.N. Costa Filho
- 关键词：XXZ model ; Ising ferromagnet ; Green's function ; Spin wave ; Impurities modes
- 刊名：Physica B
- 出版年：1 April, 2014
- 年：2014
- 卷：438
- 期：Complete
- 页码：78-83
- 全文大小：553 K
文摘
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 位. A numerical study is performed showing two types of localized modes (s and p). The modes depend on 位 and the degeneracy of the acoustic modes is broken.