拓扑手性晶体中的金属电光效应
Metallic electro-optic effects in topological chiral crystals
AI总结：
本研究针对SG198拓扑手性晶体，通过紧束缚模型与第一性原理计算，发现该类材料存在非零贝里曲率偶极子，且BeAu中可在实验条件下观测到磁致电光效应。
摘要：
拓扑手性晶体已成为研究光学现象的优质材料平台，这类光学现象源于钉扎在时间反演不变动量点的多重手性能带交叉附近独特的费米面贝里曲率与轨道磁矩织构。本工作中，我们借助紧束缚模型与基于第一性原理的计算，研究了属于198号空间群（SG198）的37种材料中，由布洛赫电子的贝里曲率与轨道磁矩产生的金属电光（EO）响应。此前学界认为SG198材料中该效应会消失，我们的研究结果显示，相反手性的拓扑荷点节点之间存在能量失配，因此存在非零的贝里曲率偶极子。此外我们发现，近期理论预测的、由费米面上贝里曲率与磁矩相互作用产生的磁致电光效应，可在实验可行的电偏压下于BeAu材料中观测到。
英文摘要：
Topological chiral crystals have emerged as a fertile material platform for investigating optical phenomena derived from the distinctive Fermi surface Berry curvature and orbital magnetic moment textures around multifold chiral band crossings pinned at the time-reversal invariant momenta. In this work, by means of tight-binding model and first principles based calculations, we investigate metallic electro-optic (EO) responses stemming from the Berry curvature and orbital magnetic moment of Bloch electrons across 37 materials belonging to space group 198 (SG198). Previously thought to vanish in SG198, our findings reveal a nonzero Berry curvature dipole attributed to the energetic misalignment between topologically charged point nodes of opposite chirality. Moreover, we find that the recently predicted magnetoelectric EO effects, which arise from the interplay between the Berry curvature and magnetic moment on the Fermi surface, are readily accessible in BeAu under experimentally feasible electric biases.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
