Proposal for Detecting Nodal-Line Semimetal Surface States with Resonant Spin-Flipped Reflection.
Proposal for Detecting Nodal-Line Semimetal Surface States with Resonant Spin-Flipped Reflection.
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DOI：
10.1103/physrevlett.121.166802
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发表时间：
2018-01
影响因子：
8.6
通讯作者：
Wei Chen;K. Luo;Lin Li;O. Zilberberg
中科院分区：
文献类型：
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作者：
Wei Chen;K. Luo;Lin Li;O. Zilberberg
拓扑节点线半金属预计会表现出独特的鼓面表面态（DSS）。然而，直接检测这些状态仍然是一个挑战。在这里，我们提出在普通金属和自旋轨道耦合的节点线半金属之间的连接处进行自旋解析输运作为其检测机制。具体来说，我们发现在这样的界面中，DSS 会引起共振自旋翻转反射。这种效应可以通过反平行磁性端子之间的垂直自旋传输和横向电荷传输来探测。在结的隧道极限中，自旋电导和电荷电导均在零能量附近表现出共振峰，为 DSS 提供了独特的证据。该特征对于色散 DSS 和界面无序都具有鲁棒性。基于数值计算，我们表明该方案可以在拓扑半金属HgCr_{2}Se_{4}中实现。
Topological nodal-line semimetals are predicted to exhibit unique drumheadlike surface states (DSSs). Yet, direct detection of such states remains a challenge. Here, we propose spin-resolved transport in a junction between a normal metal and a spin-orbit coupled nodal-line semimetal as the mechanism for their detection. Specifically, we find that in such an interface the DSSs induce resonant spin-flipped reflection. This effect can be probed by both vertical spin transport and lateral charge transport between antiparallel magnetic terminals. In the tunneling limit of the junction, both spin and charge conductances exhibit a resonant peak around zero energy, providing unique evidence of the DSSs. This signature is robust to both dispersive DSSs and interface disorder. Based on numerical calculations, we show that the scheme can be implemented in the topological semimetal HgCr_{2}Se_{4}.