Collective modes in a Dirac insulator with short range interactions

Collective modes in a Dirac insulator with short range interactions
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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
期刊:
影响因子:
3.7
通讯作者:
虞跃
虞跃
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
虞跃

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我们研究具有最近邻相互作用的 Haldane 模型。我们发现由于赝自旋和谷自由度的相互作用而产生了类似一维的集体模式。在大带隙或中等相互作用极限下,这些激发是位于带隙中的低能量模式。平凡绝缘体相和Chern绝缘体相的色散关系有本质上的不同,因此可以用来识别具有体特性的Haldane模型的拓扑。我们还讨论了如何在冷原子系统中检测这些模式。当物理电流-电流相互作用被引入霍尔丹模型或凯恩-梅勒模型时,阿贝尔规范理论就会出现。
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.
DOI: 10.1093/acprof:oso/9780199227259.001.0001
发表时间: 2004-08
期刊: Thermal Science
影响因子: 1.7
作者:
X. Wen
通讯作者: X. Wen
DOI: 10.1063/1.2155760
发表时间: 2005-11
期刊: Physics Today
影响因子: 3.5
作者:
M. Fisher
通讯作者: M. Fisher