Weak antilocalization effect and noncentrosymmetric superconductivity in a topologically nontrivial semimetal LuPdBi.
Weak antilocalization effect and noncentrosymmetric superconductivity in a topologically nontrivial semimetal LuPdBi.
复制标题
拓扑非平凡半金属 LuPdBi 中的弱反局域效应和非中心对称超导性
DOI：
10.1038/srep05709
复制
发表时间：
2014-07-21
影响因子：
4.6
通讯作者：
Zhang XX
中科院分区：
文献类型：
--
作者：
Xu G;Wang W;Zhang X;Du Y;Liu E;Wang S;Wu G;Liu Z;Zhang XX
近年来，大量的半赫斯勒化合物被提出作为具有可调物理性质的三维拓扑绝缘体。然而，由于体电导的主要贡献，在这些半Heusler候选人中没有观察到与拓扑表面状态相关的传输测量。在这里，我们表明，通过减少散装载流子的流动性，一个二维（2D）弱反局域化（WAL）效应，拓扑表面状态的标志之一，实验揭示了从倾斜磁场依赖的磁导在拓扑非平凡的半金属LuPdBi。除了观察到二维WAL效应外，在同一块体LuPdBi中，在Tc ~ 1.7K处还观察到超导转变。 定量分析的框架内的一个广义BCS理论导致的结论是，非中心对称的LuPdBi的超导性是完全缺口与可能的非常规配对字符。在同一块体合金中超导性和拓扑表面态的输运特征的共存表明LuPdBi代表了作为拓扑超导体的非常有前途的候选者。
A large number of half-Heusler compounds have been recently proposed as three-dimensional (3D) topological insulators (TIs) with tunable physical properties. However, no transport measurements associated with the topological surface states have been observed in these half-Heusler candidates due to the dominating contribution from bulk electrical conductance. Here we show that, by reducing the mobility of bulk carriers, a two-dimensional (2D) weak antilocalization (WAL) effect, one of the hallmarks of topological surface states, was experimentally revealed from the tilted magnetic field dependence of magnetoconductance in a topologically nontrivial semimetal LuPdBi. Besides the observation of a 2D WAL effect, a superconducting transition was revealed atTc~ 1.7 K in the same bulk LuPdBi. Quantitative analysis within the framework of a generalized BCS theory leads to the conclusion that the noncentrosymmetric superconductivity of LuPdBi is fully gapped with a possibly unconventional pairing character. The co-existence of superconductivity and the transport signature of topological surface states in the same bulk alloy suggests that LuPdBi represents a very promising candidate as a topological superconductor.
登录
查看更多内容
影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
8.6
作者：
Chen, J.;Qin, H. J.;Lu, L.
通讯作者：
Lu, L.
影响因子：
8.6
作者：
FISK, Z;CANFIELD, PC;SEAMAN, CL
通讯作者：
SEAMAN, CL
影响因子：
8.6
作者：
Linder, Jacob;Tanaka, Yukio;Nagaosa, Naoto
通讯作者：
Nagaosa, Naoto
影响因子：
4.6
作者：
Bao, Lihong;He, Liang;Meyer, Nicholas;Kou, Xufeng;Zhang, Peng;Chen, Zhi-gang;Fedorov, Alexei V.;Zou, Jin;Riedemann, Trevor M.;Lograsso, Thomas A.;Wang, Kang L.;Tuttle, Gary;Xiu, Faxian
通讯作者：
Xiu, Faxian