论文标题
在相互作用的双发性费米子中出现不对称的费米秩序
Emergence of asymmetric fermionic order in interacting birefringent fermions
论文作者
论文摘要
双重福里具有两个不同的费米速度的频谱。在这里，基于晶格模型，我们使用平均场方法来研究双重福里的相互作用诱导的相变。我们同时考虑短程最近的邻居（NN）和下一期邻居（NNN）排斥性相互作用，并在不同条件下计算相图。我们发现，NN相互作用可以诱导不对称的电荷密度波顺序，而NNN相互作用可以在跳跃积分中以很大的各向异性极限驱动不对称的量子异常大厅顺序（AQAH），β\ rightarrow 1。乐队。这样的不对称的费米子订单可以归因于双发性费米子的特定晶格几何。还讨论了我们结果对实验的含义。
The birefringent fermions possess a spectrum with two distinct Fermi velocities. Here based on the lattice model, we use the mean-field method to investigate the interaction-induced phase transitions of the birefringent fermions. We consider both the short-range nearest-neighbor (NN) and next-nearest-neighbor (NNN) repulsive interactions and calculate the phase diagrams under different conditions. We find that the NN interactions can induce the asymmetric charge density wave order, while the NNN interactions can drive the asymmetric quantum anomalous Hall order (AQAH) in the large limit of anisotropy in the hopping integrals, β\rightarrow 1. The AQAH order is characterized by the unequal loop currents connecting the NNN sites and by the appearance of a gap between the two conduction (valence) bands. Such asymmetric fermionic orders can be attributed to the specific lattice geometry of the birefringent fermions. The implications of our results for experiments are also discussed.
