Collective modes in a Dirac insulator with short range interactions
Collective modes in a Dirac insulator with short range interactions
复制标题
具有短程相互作用的狄拉克绝缘体中的集体模式
DOI:
10.1103/physrevb.91.125126
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发表时间:
2014-08
影响因子:
3.7
通讯作者:
虞跃
中科院分区:
文献类型:
--
作者:
虞跃
We study a Haldane model with nearest neighbor interactions. We find one-dimensional like collective modes arising due to the interplay of pseudo-spin and valley degrees of freedom. In the large band gap or moderate interaction limit, these excitations are low energy modes lying in the band gap. The dispersion relations are qualitatively different in trivial insulator phase and Chern insulator phase, thus can be used to identify the topology of the Haldane model with the bulk property. We also discuss how to detect these modes in cold atom systems. An abelian gauge theory will emerge when a physical current-current interaction is introduced to the Haldane model or the Kane-Mele model.
影响因子:
1.7
作者:
X. Wen
通讯作者:
X. Wen
影响因子:
3.5
作者:
M. Fisher
通讯作者:
M. Fisher