论文标题
在非中心磁性Weyl半含量中观察Fermi弧和Weyl节点
Observation of Fermi arcs and Weyl nodes in a non-centrosymmetric magnetic Weyl semimetal
论文作者
论文摘要
Weyl Semimetal（WSM）是一种新型的量子物质状态，将Weyl fermions寄给了由于反转或时间反向对称性的破坏而产生的新兴准粒子。损坏的时间反向对称性产生的磁WSM为了解磁性阶和Weyl物理之间的相互作用提供了一个非凡的平台，但是很少有人实现WSM。在这里，我们通过角度分辨光发射光谱（ARPES）和基于密度功能理论的计算，将CEALSI识别为新的非中心磁WSM。我们的表面敏感性真空紫外线ARPES数据证实了表面费米弧的存在，因为烟枪在Cealsi中存在Weyl Semimetallic态的证据。我们还使用散装敏感的软X射线ARPES测量值观察CEALSI中的散装Weyl锥。此外，在Fermi水平附近发现了CE 4F，这表明CEALSI是一个独特的平台，用于研究拓扑，磁性和电子相关性相互作用而导致的外来量子现象。
Weyl semimetal (WSM), a novel state of quantum matter, hosts Weyl fermions as emergent quasiparticles resulting from the breaking of either inversion or time-reversal symmetry. Magnetic WSMs that arise from broken time-reversal symmetry provide an exceptional platform to understand the interplay between magnetic order and Weyl physics, but few WSMs have been realized. Here, we identify CeAlSi as a new non-centrosymmetric magnetic WSM via angle-resolved photoemission spectroscopy (ARPES) and first-principles, density-functional theory based calculations. Our surface-sensitive vacuum ultraviolet ARPES data confirms the presence of surface Fermi arcs as, the smoking gun evidence for the existence of the Weyl semimetallic state in CeAlSi. We also observe bulk Weyl cones in CeAlSi using bulk-sensitive soft-X-ray ARPES measurements. In addition, Ce 4f at bands are found near the Fermi level, indicating that CeAlSi is a unique platform for investigating exotic quantum phenomena resulting from the interaction of topology, magnetism and electronic correlations.
