论文标题
基于分层钛的双拓扑超导状态在基于钛的oxypnictide超导体bati $ _2 $ sb $ _2 $ o
Dual topological superconducting states in the layered titanium-based oxypnictide superconductor BaTi$_2$Sb$_2$O
论文作者
论文摘要
长期以来，拓扑超导体已被预测，可遵守非亚伯统计的Majorana零模式，并具有实现非确定性拓扑量子计算的潜力。但是，拓扑超导体的物质实现仍然是凝结物理学的挑战。利用高分辨率角度分辨的光发射光谱和第一原理计算，我们预测并揭示了Fermi Energity（$ e_f $）在基于titanium titanium oxypnictide oxypnictide oxypnictide oxypnictide oxypnictide superdocductor bati bati bati $ $ _2 $ _2 $ __2 $ sb $ sb $ sb $ o的Fermi Energity（$ e_f $）中拓扑狄拉克半岛和拓扑绝缘体的共存。进一步的自旋分辨测量结果证实了其旋转螺旋的表面状态左右$ e_f $，在拓扑上受到保护，并为一种材料中的Majorana零模式和Majoragan Fland带提供了机会。托管双重拓扑超导状态，内在的超导体BATI $ _2 $ sb $ _2 $ o有望成为进一步调查拓扑超导性的有前途的平台。
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 ($E_F$) in the titanium-based oxypnictide superconductor BaTi$_2$Sb$_2$O. Further spin-resolved measurements confirm its spin-helical surface states around $E_F$, which are topologically protected and give an opportunity for realization of Majorana zero modes and Majorana flat bands in one material. Hosting dual topological superconducting states, the intrinsic superconductor BaTi$_2$Sb$_2$O is expected to be a promising platform for further investigation of topological superconductivity.
