Edge Magnon Excitation in Spin Dimer Systems
Edge Magnon Excitation in Spin Dimer Systems
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DOI：
10.7566/jpsj.85.104707
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发表时间：
2016-09
影响因子：
1.7
通讯作者：
Ryohei Sakaguchi;M. Matsumoto
中科院分区：
文献类型：
--
作者：
Ryohei Sakaguchi;M. Matsumoto
研究了双层蜂窝晶格上自旋二聚体系统在锯齿形边缘存在下的磁激发，其中无序相和有序相可以通过量子相变来控制。与具有锯齿形边缘的石墨烯的情况类似，在无序相中出现平坦边缘磁振子模式。在有序相中，有限磁矩对磁振子产生平均场势。由于边缘和体位置上的势不均匀，影响了激发，边缘模的色散偏离了平坦形状。我们研究了边磁振子模在量子相变相变过程中的演化，并讨论了与单层蜂窝晶格上有序自旋系统的相似性。
Magnetic excitation in a spin dimer system on a bilayer honeycomb lattice is investigated in the presence of a zigzag edge, where disordered and ordered phases can be controlled by a quantum phase transition. In analogy with the case of graphene with a zigzag edge, a flat edge magnon mode appears in the disordered phase. In an ordered phase, a finite magnetic moment generates a mean-field potential to the magnon. Since the potential is nonuniform on the edge and bulk sites, it affects the excitation, and the dispersion of the edge mode deviates from the flat shape. We investigate how the edge magnon mode evolves when the phase changes through the quantum phase transition and discuss the similarities to ordered spin systems on a monolayer honeycomb lattice.