Weyl半金属
角分辨光电子能谱
凝聚态物理
物理
准粒子
磁性
半金属
光电发射光谱学
点反射
费米面
费米子
望远镜
费米能级
电子结构
量子力学
超导电性
电子
带隙
谱线
作者
Anup Pradhan Sakhya,Cheng-Yi Huang,Gyanendra Dhakal,Xue-Jian Gao,Sabin Regmi,Baokai Wang,Wei Wen,Ruihua He,Xiaohan Yao,Robert Connon Smith,Milo Sprague,Shunye Gao,Bahadur Singh,Hsin Lin,Su‐Yang Xu,Fazel Tafti,Arun Bansil,Madhab Neupane
出处
期刊:Physical Review Materials
[American Physical Society]
日期:2023-05-16
卷期号:7 (5)
被引量:13
标识
DOI:10.1103/physrevmaterials.7.l051202
摘要
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 only a few WSMs have been realized. Here, we identify CeAlSi as a new noncentrosymmetric magnetic WSM via angle-resolved photoemission spectroscopy (ARPES) and first-principles, density-functional theory based calculations. Our surface-sensitive vacuum ultraviolet ARPES data confirm the presence of surface Fermi arcs as the conclusive evidence for the existence of the Weyl semimetallic state in CeAlSi. We also observe bulk Weyl cones at the Fermi arc terminations in CeAlSi using bulk-sensitive soft-x-ray ARPES measurements. These results implicate CeAlSi as a unique platform for investigating exotic quantum phenomena resulting from the interaction of topology and magnetism.
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