Termination-dependent topological surface states in nodal-loop semimetal HfP2
Termination-dependent topological surface states in nodal-loop semimetal HfP2
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DOI：
10.1103/physrevmaterials.4.054201
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发表时间：
2019-06
影响因子：
3.4
通讯作者：
Christopher Sims;Md Mofazzel Hosen;H. Aramberri;Cheng-Yi Huang;Gyanendra Dhakal;Klauss Dimitri;Firoz Kabir;Sabin Regmi;Xiaoting Zhou;Tay-Rong Chang;Hsin Lin;D. Kaczorowski;N. Kioussis;M. Neupane
中科院分区：
文献类型：
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作者：
Christopher Sims;Md Mofazzel Hosen;H. Aramberri;Cheng-Yi Huang;Gyanendra Dhakal;Klauss Dimitri;Firoz Kabir;Sabin Regmi;Xiaoting Zhou;Tay-Rong Chang;Hsin Lin;D. Kaczorowski;N. Kioussis;M. Neupane
对称性在物理学的所有学科中都起着重要的作用。在拓扑材料领域内，人们对理解晶体和内部对称性的力学如何保护导带和价带之间的交叉有很大的兴趣。此外，探索这一方向可以导致对具有各种对称性的晶体的拓扑性质的更深入的理解。首次报道了用角分辨光电子能谱（ARPES）对节环半金属HfP2拓扑表面态的实验观测，并得到了第一性原理计算的支持.我们的研究表明，在这种化合物的终止依赖的表面状态。我们的实验数据显示，表面状态连接到三个独特的节点回路，理论计算证实是拓扑非平凡的。这项工作表明，过渡金属双镍族化合物提供了一个很好的平台，研究非平凡的非对称对称性保护的拓扑状态。
Symmetry plays a major role in all disciplines of physics. Within the field of topological materials there is a great interest in understanding how the mechanics of crystalline and internal symmetries protect crossings between the conduction and valence bands. Additionally, exploring this direction can lead to a deeper understanding on the topological properties of crystals hosting a variety of symmetries. For the first time, we report the experimental observation of topological surface states in the nodal loop semimetal HfP2 using angle resolved photoemission spectroscopy (ARPES) which is supported by our first principles calculations. Our study shows termination dependent surface states in this compound. Our experimental data reveal surface states linked to three unique nodal loops confirmed by theoretical calculation to be topologically non-trivial. This work demonstrates that transition metal dipnictides provide a good platform to study non-trivial topological states protected by nonsymmorphic symmetry.