Unconventional Superconductivity on a Topological Insulator
Unconventional Superconductivity on a Topological Insulator
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DOI：
10.1103/physrevlett.104.067001
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发表时间：
2010-02-12
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Linder, Jacob;Tanaka, Yukio;Nagaosa, Naoto
我们研究了拓扑绝缘体（TI）表面上的邻近诱导超导电性，重点是非常规配对。我们发现，激发光谱变得gapless任何自旋三重态配对，这样的subgap束缚态和Andreev反射强烈抑制。对于自旋单态配对，在d（xy）波的情况下，零能表面态成为马约拉纳费米子，与拓扑平凡的高T-c铜氧化物中实现的情况相反。我们还研究了塞曼场对表面态的影响。这一领域的幅度和方向示出强烈影响的传输特性，在没有TI的情况下相比。我们预测的实验签名的马约拉纳国家通过电导光谱。
We study proximity-induced superconductivity on the surface of a topological insulator (TI), focusing on unconventional pairing. We find that the excitation spectrum becomes gapless for any spin-triplet pairing, such that both subgap bound states and Andreev reflection is strongly suppressed. For spin-singlet pairing, the zero-energy surface state in the d(xy)-wave case becomes a Majorana fermion, in contrast with the situation realized in the topologically trivial high-T-c cuprates. We also study the influence of a Zeeman field on the surface states. Both the magnitude and direction of this field are shown to strongly influence the transport properties, in contrast with the case without TI. We predict an experimental signature of the Majorana states via conductance spectroscopy.