Dual topological states in the layered titanium-based oxypnictide superconductor BaTi2Sb2O
Dual topological states in the layered titanium-based oxypnictide superconductor BaTi2Sb2O
复制标题
层状钛基氧磷元素超导体BaTi2Sb2O中的双拓扑态
DOI：
10.1038/s41535-022-00477-z
复制
发表时间：
2022-06-28
影响因子：
5.7
通讯作者：
Shen, D. W.
中科院分区：
文献类型：
--
作者：
Huang, Z.;Liu, W. L.;Shen, D. W.
拓扑超导体中的Majorana零模具有非阿贝尔统计性质，具有实现非退相干拓扑量子计算的潜力。然而，拓扑超导体的物质实现仍然是凝聚态物理中的一个挑战。利用高分辨率角分辨光电子能谱和第一性原理计算，我们预测并揭示了钛基氧铌酸盐超导体BaTi2Sb2O在费米能级附近拓扑狄拉克半金属态和拓扑绝缘体态的共存.进一步的自旋分辨测量证实了它在EF附近的自旋螺旋表面态，这些表面态是拓扑保护的，并为在一种材料中实现Majorana零模和Majorana平带提供了机会。具有双拓扑态的本征超导体BaTi_2Sb_2O有望成为进一步研究拓扑超导电性的一个很有前途的平台。
Topological superconductors have long been predicted to host Majorana zero modes which obey non-Abelian statistics and have potential for realizing non-decoherence topological quantum computation. However, material realization of topological superconductors is still a challenge in condensed matter physics. Utilizing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations, we predict and then unveil the coexistence of topological Dirac semimetal and topological insulator states in the vicinity of Fermi energy (EF) in the titanium-based oxypnictide superconductor BaTi2Sb2O. Further spin-resolved measurements confirm its spin-helical surface states aroundEF, which are topologically protected and give an opportunity for realization of Majorana zero modes and Majorana flat bands in one material. Hosting dual topological states, the intrinsic superconductor BaTi2Sb2O is expected to be a promising platform for further investigation of topological superconductivity.