论文标题
耗散引起的连续Weyl材料中的拓扑过渡
Dissipation-induced topological transitions in continuous Weyl materials
论文作者
论文摘要
最近使用电磁，声学和其他基于经典波浪的平台实现了许多拓扑非平凡的系统。作为最简单的三维拓扑系统，在这种情况下，Weyl Semimetals引起了极大的关注。然而，在存在耗散的情况下，拓扑韦尔态的鲁棒性尚未详细研究。在本文中，我们证明了Weyl材料的对称特性在造成损失的情况下在拓扑电荷的歼灭中起着至关重要的作用。我们考虑了连续等离子体介质的具体示例，并比较了基于破坏时间反转对称性（互惠）或破坏反转对称性的Weyl点色散的两个可能实现。从理论上讲，我们表明，拓扑状态从根本上对非近代实现中的损失具有更大的稳定性。我们的发现阐明了耗散对三维拓扑材料和超材料的影响。
Many topologically non-trivial systems have been recently realized using electromagnetic, acoustic, and other classical wave-based platforms. As the simplest class of three-dimensional topological systems, Weyl semimetals have attracted significant attention in this context. However, the robustness of the topological Weyl state in the presence of dissipation, which is common to most classical realizations, has not been studied in detail. In this paper, we demonstrate that the symmetry properties of the Weyl material play a crucial role in the annihilation of topological charges in the presence of losses. We consider the specific example of a continuous plasma medium and compare two possible realizations of a Weyl-point dispersion based on breaking time-reversal symmetry (reciprocity) or breaking inversion symmetry. We theoretically show that the topological state is fundamentally more robust against losses in the nonreciprocal realization. Our findings elucidate the impact of dissipation on three-dimensional topological materials and metamaterials.
