论文标题
具有较强库仑相互作用的线节半段的稳定性和对称性状态的特性的稳定性
Stability of line-node semimetals with strong Coulomb interactions and properties of the symmetry-broken state
论文作者
论文摘要
我们采用示意的蒙特卡洛模拟来建立在存在库仑相互作用的情况下线节半学的稳定性的标准。我们的结果表明，在我们确定的有限相互作用阈值下发生的手性绝缘状态。我们还计算了在对称和对称阶段中的平面外和平面磁场的Landau水平。我们发现磁场伴侣与手性阶参数伴侣，这意味着可以在实验中进行原位操纵这种自由度。最后，我们在对称性阶段检查边缘状态的存在。在系统的边界上，我们注意到在对称阶段中存在的金属“鼓头”状态被忽略了。然而，对称性阶段允许以域壁的形式以宏观顺序参数形式出现拓扑缺陷，该域壁的形式是托有金属“接口状态”。这些由二维界面上发生的线状间隙封闭式组成。
We employ diagrammatic Monte Carlo simulations to establish criteria for the stability of line-node semimetals in the presence of Coulomb interactions. Our results indicate a phase transition to a chiral insulating state that occurs at a finite interaction threshold which we determine. We also compute the Landau levels for out-of-plane and in-plane magnetic fields in the symmetric and symmetry-broken phases. We find that the magnetic field couples to the chiral order parameter, implying that this degree of freedom can be manipulated in situ in experiments. Finally, we check the existence of edge states in the symmetry-broken phase. On the system's boundary, we note that the metallic "drum-head" states that exist in the symmetric phase are gapped out. However, the symmetry-broken phase permits topological defects in the macroscopic order parameter in the form of domain walls, which host metallic "interface states." These consist of line-like gap-closings that occur on the two-dimensional interfaces.
