Observation of topological Dirac fermions and surface states in superconducting BaSn3
Observation of topological Dirac fermions and surface states in superconducting BaSn3
复制标题
超导 BaSn3 中拓扑狄拉克费米子和表面态的观察
DOI：
10.1103/physrevb.103.155148
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发表时间：
2021
影响因子：
3.7
通讯作者：
Chen Y. L.
中科院分区：
文献类型：
--
作者：
Huang K.;Luo A. Y.;Chen C.;Zhang G. N.;Liu X. L.;Li Y. W.;Wu F.;Cui S. T.;Sun Z.;Jozwiak Chris;Bostwick Aaron;Rotenberg Eli;Yang H. F.;Yang L. X.;Xu G.;Guo Y. F.;Liu Z. K.;Chen Y. L.
拓扑电子结构与超导电性之间的相互作用最近引起了极大的研究兴趣，因为它们可以诱导出拓扑超导(TSCs)，这可能被用来实现量子计算中的拓扑量子比特。在各种TSC候选中，超导()被预测为一种拓扑狄拉克半金属(TDS)，沿Γ方向有两对狄拉克点。在这里，通过角分辨光电子能谱和从头算的结合，我们确定了预测的拓扑狄拉克费米子，并确认了化合物的TDS性质。此外，我们还观察到了连接狄拉克点的表面态。我们的观察表明，它是一个具有非平凡拓扑电子结构的超导体。
The interplay between topological electronic structure and superconductivity has attracted tremendous research interests recently as they could induce topological superconductivity (TSCs) which may be used to realize topological qubits for quantum computation. Among various TSC candidates, superconducting() has been predicted to be a topological Dirac semimetal (TDS) hosting two pairs of Dirac points along the Γ-direction. Here, by combining the use of angle-resolved photoemission spectroscopy andab initiocalculations, we identified the predicted topological Dirac fermions and confirmed the TDS nature of the compound. In addition, we observed surface states connecting the Dirac points. Our observations demonstrateas a superconductor with nontrivial topological electronic structures.