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arXiv 1605.00548cond-mat.supr-concond-mat.str-el
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非中心对称块状超导体PbTaSe2的超导拓扑表面态

Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2

Syu-You Guan, Peng-Jen Chen, Ming-Wen Chu, Raman Sankar, Fangcheng Chou, Horng-Tay Jeng, Chia-Seng Chang, Tien-Ming Chuang

摘要:

拓扑超导体的研究是当代凝聚态系统中最紧迫的问题之一。TSC的特征在于在本体和拓扑保护的无带隙表面(或边缘)状态中的完全超导能隙。在TSC的每个涡旋核中,存在零能量的Majorana束缚态,它们被预测表现出非阿贝尔统计,并形成容错量子计算的基础。到目前为止,没有化学计量的体材料表现出所需的拓扑表面态(TSS)在费米能级结合完全带隙的体超导。在这里,我们报告原子尺度的可视化的TSS的非中心对称的完全带隙的超导体,PbTaSe 2。利用准粒子散射干涉(QPI)成像技术,我们在这种全带隙超导体的Pb端表面发现了两个具有Dirac点的TSS,其内部TSS和部分外部TSS与费米能级相交,其Dirac点位于E~1.0eV。这一发现揭示了PbTaSe 2作为TSC的有希望的候选者。

英文摘要:

The search for topological superconductors (TSCs) is one of the most urgent contemporary problems in condensed matter systems. TSCs are characterized by a full superconducting gap in the bulk and topologically protected gapless surface (or edge) states. Within each vortex core of TSCs, there exist the zero energy Majorana bound states, which are predicted to exhibit non-Abelian statistics and to form the basis of the fault-tolerant quantum computation. So far, no stoichiometric bulk material exhibits the required topological surface states (TSSs) at Fermi level combined with fully gapped bulk superconductivity. Here, we report atomic scale visualization of the TSSs of the non-centrosymmetric fully-gapped superconductor, PbTaSe2. Using quasiparticle scattering interference (QPI) imaging, we find two TSSs with a Dirac point at E~1.0eV, of which the inner TSS and partial outer TSS cross Fermi level, on the Pb-terminated surface of this fully gapped superconductor. This discovery reveals PbTaSe2 as a promising candidate as a TSC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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