一溴化金中的交叉实节点线声子
Crossed real nodal-line phonons in gold monobromide
AI总结：
本研究提出受时空反演对称性保护的交叉实节点线拓扑相，在一溴化金声子谱中发现独特的节点线配对构型与非平庸实陈数，揭示其特殊表面/铰链态，拓展了拓扑态研究范畴并预测实验可实现性。
摘要：
时空反演对称性可在晶体材料中产生引人关注的无自旋激发类型。本文提出了一种受时空反演对称性保护的拓扑相——一溴化金（AuBr）声子谱中的交叉实节点线（RNL）。在AuBr中存在四条直线节点线，它们通过由两条较低能带形成的交叉节点线相连。值得注意的是，四条直线节点线中每相邻两条为一对，共同构成具有非平庸实陈数的交叉RNL，这种RNL的构型与配对模式此前从未被报道过。该交叉RNL展现出区别于传统RNL的独特表面态和铰链态。本文还研究了交叉RNL的对称性保护机制，以及其在保持对称性的应变作用下的转变。研究结果为一类全新的拓扑态研究打开了大门，并预测该拓扑态可在实验合成的材料中实现。
英文摘要：
Spacetime inversion symmetry can generate intriguing types of spinless excitations in crystalline materials. Here, we propose a topological phase protected by spacetime inversion symmetry - the crossed real nodal line (RNL) in the phonon spectrum of gold monobromide (AuBr). In AuBr, there exist four straight nodal lines, which are linked by a crossed nodal line formed by two lower bands. Remarkably, each adjacent two of the four straight nodal lines is a pair, forming a crossed RNL with nontrivial real Chern number. Such configuration and pairing mode of RNL have never been reported. The crossed RNL exhibits unique surface and hinge states distinguished from that of the conventional RNLs. The symmetry protection and the transformation under the symmetry-preserving strain of the crossed RNL are also investigated. Our results open the door to a new class of topological states, and predict its realization in experimentally synthesized material.
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