论文标题
从拓扑节点线的角度来看，密度波趋势
Density-wave tendency from a topological nodal-line perspective
论文作者
论文摘要
对密度波的理解是我们对电子量子问题的见解的重要组成部分。在这里，我们为现有机制提出了一个额外的镶嵌，例如费米 - 表面嵌套，电子 - 音波耦合和激子冷凝。特别是，我们发现在存在磁场的情况下，某些2D旋转密度波系统等效于3D Dirac节点线系统，其电子结构采用了Dirac-Fermion Landau级别的形式，并可以直接分析其最佳填充。随后的最小能量波矢量在连续范围内变化，并且与2D中原始费米表面没有直接连接。此外，我们执行数值计算，其中模型示例的结果支持我们的理论。我们的研究指出，我们尚未完全了解新兴的密度波形形式。
The understanding of density waves is a vital component of our insight into electronic quantum matters. Here, we propose an additional mosaic to the existing mechanisms such as Fermi-surface nesting, electron-phonon coupling, and exciton condensation. In particular, we find that certain 2D spin density-wave systems are equivalent to 3D Dirac nodal-line systems in the presence of a magnetic field, whose electronic structure takes the form of Dirac-fermion Landau levels and allows a straightforward analysis of its optimal filling. The subsequent minimum-energy wave vector varies over a continuous range and shows no direct connection to the original Fermi surfaces in 2D. Also, we carry out numerical calculations where the results on model examples support our theory. Our study points out that we have yet to attain a complete understanding of the emergent density wave formalism.
