Hidden symmetry and protection of Dirac points on the honeycomb lattice.
Hidden symmetry and protection of Dirac points on the honeycomb lattice.
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蜂窝晶格上狄拉克点的隐藏对称性与保护
DOI：
10.1038/srep17571
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发表时间：
2015-12-07
影响因子：
4.6
通讯作者：
Chen W
中科院分区：
文献类型：
--
作者：
Hou JM;Chen W
蜂窝晶格具有新颖的能带结构，其特征是布里渊区有两个不同的狄拉克点，主导了蜂窝结构材料的大部分物理性能。然而，迄今为止，狄拉克点的起源尚不清楚。在这里，我们发现了蜂窝晶格上的隐藏对称性，并证明了狄拉克点的存在性正是受到这种隐藏对称性的保护。此外，在蜂窝晶格上理论预测和实验观察到的狄拉克点的移动和合并以及量子相变也可以通过隐藏对称性的参数相关演化来完美解释。
The honeycomb lattice possesses a novel energy band structure, which is characterized by two distinct Dirac points in the Brillouin zone, dominating most of the physical properties of the honeycomb structure materials. However, up till now, the origin of the Dirac points is unclear yet. Here, we discover a hidden symmetry on the honeycomb lattice and prove that the existence of Dirac points is exactly protected by such hidden symmetry. Furthermore, the moving and merging of the Dirac points and a quantum phase transition, which have been theoretically predicted and experimentally observed on the honeycomb lattice, can also be perfectly explained by the parameter dependent evolution of the hidden symmetry.