Majorana Fermions and Exotic Surface Andreev Bound States in Topological Superconductors: Application to CuxBi2Se3
Majorana Fermions and Exotic Surface Andreev Bound States in Topological Superconductors: Application to CuxBi2Se3
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DOI：
10.1103/physrevlett.108.107005
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发表时间：
2012-03-08
影响因子：
8.6
通讯作者：
Fu, Liang
中科院分区：
文献类型：
--
作者：
Hsieh, Timothy H.;Fu, Liang
最近发现的超导体CuxBi2Se3是三维时间逆不变拓扑超导体的候选者，预计它具有坚固的表面Andreev束缚态，承载无质量的马约拉纳费米子。在本文中，我们用解析和数值方法发现了k = 0时线性色散的马约拉纳费米子，它们在费米动量附近平滑地演化成一个新的无间隙表面Andreev束缚态分支。后者是由非平凡带结构和奇宇称对对称性共同产生的一种新型Andreev束缚态。这些表面Andreev束缚态的隧穿光谱与最近的点接触光谱实验结果一致[j]。Sasaki et al.，物理学。[j] .光子学报，1997,17(6):1177 - 1177(2011)]，并对低温隧穿和光发射实验进行了预测。
The recently discovered superconductor CuxBi2Se3 is a candidate for three-dimensional time-reversal-invariant topological superconductors, which are predicted to have robust surface Andreev bound states hosting massless Majorana fermions. In this work, we analytically and numerically find the linearly dispersing Majorana fermions at k = 0, which smoothly evolve into a new branch of gapless surface Andreev bound states near the Fermi momentum. The latter is a new type of Andreev bound states resulting from both the nontrivial band structure and the odd-parity pairing symmetry. The tunneling spectra of these surface Andreev bound states agree well with a recent point-contact spectroscopy experiment [S. Sasaki et al., Phys. Rev. Lett. 107, 217001 (2011)] and yield additional predictions for low temperature tunneling and photoemission experiments.