Experimental studies of the topological superconductor CuxBi2Se3
Experimental studies of the topological superconductor CuxBi2Se3
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DOI：
10.1088/1742-6596/449/1/012033
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Y. Ando;K. Segawa;S. Sasaki;M. Kriener
中科院分区：
文献类型：
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作者：
Y. Ando;K. Segawa;S. Sasaki;M. Kriener
CuxBi2Se3最近被阐明为第一个由螺旋Majorana费米子组成的无间隙表面准粒子态的时间反转不变拓扑超导体的例子。通过点接触光谱间接探测了CuxBi2Se3表面的巡回无质量Majorana态，得到了CuxBi2Se3中存在拓扑超导电性的证据。在本文中，我们给出了新的点接触光谱数据，补充了以前的结论。我们还给出了CuxBi2Se3超导样品的各向异性正常态电阻率数据，这些数据强烈地表明该材料不仅有效质量而且散射率都是各向异性的~3倍。
CuxBi2Se3 was recently elucidated to be the first example of a time-reversal-invariant topological superconductor characterized by the gapless surface quasiparticle states consisting of helical Majorana fermions. The evidence for topological superconductivity in CuxBi2Se3 was obtained by the point-contact spectroscopy that indirectly detected the itinerant massless Majorana state on the surface. In this paper, we show new point-contact spectroscopy data which supplement the previous conclusion. We also present the anisotropic normal-state resistivity data for superconducting samples of CuxBi2Se3 which strongly suggest that not only the effective mass but also the scattering rate is anisotropic in this material by a factor of ~3.