基于Floquet工程化三重费米子产生的可控Weyl节点和费米弧
Controllable Weyl Nodes and Fermi Arcs from Floquet Engineering Triple Fermions
AI总结：
研究圆偏振光照射下三重费米子的演化，通过第一性原理计算和Floquet定理证明WC型TiO及其类似物可实现向可控Weyl半金属相的转变。
摘要：
Floquet工程化以周期性驱动作为设计理想拓扑态的有力工具，一直是近期深入研究的主题。在此，我们展示Floquet工程化的应用，以研究圆偏振光（CPL）照射下拓扑三重费米子的演化，这一现象目前仍是个谜。通过使用第一性原理计算和Floquet定理，我们证明WC型TiO及其类似物是三重费米子Floquet工程化的有希望的候选材料。对称性分析表明，CPL的电场可以打破特定的对称性，例如时间反演对称性及其与空间对称性的组合，从而诱导出向灵活可控的Weyl半金属相的转变。由光控制的存留空间对称性保证了Weyl节点位于动量空间中的高对称线或高对称面上。我们的发现聚焦于以三重费米子为特征的现实材料中的Floquet工程化，将促进理论和实验两方面的兴趣。
英文摘要：
Floquet engineering with periodic driving as a powerful tool for designing desirable topological states has been the subject of intense recent studies. Here, we present the application of Floquet engineering to investigate evolution of topological triple fermions under irradiation of circularly polarized light (CPL), a phenomenon that currently remains a mystery. By using first-principles calculations and Floquet theorem, we demonstrate that WC-type TiO and its analogues are promising candidates for Floquet engineering of triple fermions. The symmetry analysis reveals that the electric field of CPL can break the specific symmetries, such as the time-reversal symmetry and its combination of spatial symmetries, inducing a transition to a flexibly controllable Weyl semimetallic phase. The survived spatial symmetry, controlled by light, guarantees that the Weyl nodes are located along the high-symmetry line or in high-symmetry planes in momentum space. Our findings focusing on Floquet engineering in realistic materials featured by triple fermions would facilitate both theoretical and experimental interest.
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