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Topological Type-II Nodal Line Semimetal and Dirac Semimetal State in Stable Kagome Compound Mg3Bi2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.jpclett.7b02129 Xiaoming Zhang 1 , Lei Jin 1 , Xuefang Dai 1 , Guodong Liu 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.jpclett.7b02129 Xiaoming Zhang 1 , Lei Jin 1 , Xuefang Dai 1 , Guodong Liu 1
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Topological type-II nodal line semimetal (NLS) was proposed quite recently and exhibits distinct properties compared with conventional type-I NLS. To date, no ambient-condition stable candidate material has been reported. Here we propose that a stable Kagome compound Mg3Bi2 can host a type-II nodal line state with the protection of time reversal and spatial inversion symmetries. Similar to type-I NLSs, the type-II nodal line in Mg3Bi2 is characterized by the drumhead surface states, which has not been observed in the previous type-II NLSs. The nodal line in Mg3Bi2 can open a minor gap, and a pair of 3D Dirac points occurs when SOC is included. The SOC-induced gap around the nodal line is quite small, and the formation of 3D Dirac points is independent of the nodal line. Therefore, the Mg3Bi2 compound is expected to be a good candidate to investigate the exotic properties of both type-II NLS and 3D Dirac semimetal states.
中文翻译：
稳定的Kagome化合物Mg 3 Bi 2中的II型拓扑节点线半金属态和Dirac半金属态
拓扑II型节点线半金属（NLS）是最近才提出的，与常规的I型NLS相比，它表现出独特的性能。迄今为止，还没有报道过环境条件稳定的候选材料。在这里，我们提出稳定的Kagome化合物Mg 3 Bi 2可以具有II型结线状态，并具有时间反转和空间反转对称性的保护。与I型NLS相似，Mg 3 Bi 2中的II型节点线的特征是鼓面表面状态，这在以前的II型NLS中没有观察到。Mg 3 Bi 2中的节点线可以打开一个较小的间隙，并且在包含SOC时会出现一对3D Dirac点。SOC引起的围绕节点线的间隙很小，并且3D Dirac点的形成与节点线无关。因此，Mg 3 Bi 2化合物有望成为研究II型NLS和3D Dirac半金属态的奇异性质的理想候选者。
更新日期：2017-09-21
中文翻译：
稳定的Kagome化合物Mg 3 Bi 2中的II型拓扑节点线半金属态和Dirac半金属态
拓扑II型节点线半金属（NLS）是最近才提出的，与常规的I型NLS相比，它表现出独特的性能。迄今为止，还没有报道过环境条件稳定的候选材料。在这里，我们提出稳定的Kagome化合物Mg 3 Bi 2可以具有II型结线状态，并具有时间反转和空间反转对称性的保护。与I型NLS相似，Mg 3 Bi 2中的II型节点线的特征是鼓面表面状态，这在以前的II型NLS中没有观察到。Mg 3 Bi 2中的节点线可以打开一个较小的间隙，并且在包含SOC时会出现一对3D Dirac点。SOC引起的围绕节点线的间隙很小，并且3D Dirac点的形成与节点线无关。因此，Mg 3 Bi 2化合物有望成为研究II型NLS和3D Dirac半金属态的奇异性质的理想候选者。
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