对称约束下韦尔节点合并过程的稳定性

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Gabriele Naselli, György Frank, Dániel Varjas, Ion Cosma Fulga, Gergő Pintér, András Pályi, Viktor Könye
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引用次数: 0

摘要

Weyl半金属中 Weyl 节点数量的变化是通过合并过程发生的,通常涉及一对带相反电荷的节点。涉及多个 Weyl 节点的更复杂过程也是可能的,但它们通常需要微调,因此稳定性较差。在这封信中,我们研究了对称性如何影响允许的合并过程及其稳定性,重点是两重旋转和时间反转(𝐶2𝒯)对称性的组合。我们发现,与直觉相反,涉及三个节点合并的过程比只涉及两个节点的过程更通用。我们的信表明,在大量量子材料中都可能观察到多Weyl合并,我们讨论了作为潜在候选材料的SrSi2和双层石墨烯。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stability of Weyl Node Merging Processes under Symmetry Constraints
Changes in the number of Weyl nodes in Weyl semimetals occur through merging processes, usually involving a pair of oppositely charged nodes. More complicated processes involving multiple Weyl nodes are also possible, but they typically require fine tuning and are thus less stable. In this Letter, we study how symmetries affect the allowed merging processes and their stability, focusing on the combination of a twofold rotation and time-reversal (𝐶2𝒯) symmetry. We find that, counterintuitively, processes involving a merging of three nodes are more generic than processes involving only two nodes. Our Letter suggests that multi-Weyl merging may be observed in a large variety of quantum materials, and we discuss SrSi2 and bilayer graphene as potential candidates.
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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