摘要
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 two-dimensional(2D) spin density-wave systems are equivalent to three-dimensional(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 minimumenergy 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.
作者
赵天伦
张亿
Tianlun Zhao;Yi Zhang(International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China)
基金
the National Key Research and Development Program of China (Grant No. 2022YFA1403700)
the National Natural Science Foundation of China (Grant Nos. 12174008 and 92270102)。