Conductance Spectroscopy of Exfoliated Thin Flakes of Nb x Bi 2 Se 3
Conductance Spectroscopy of Exfoliated Thin Flakes of Nb x Bi 2 Se 3
复制标题
Nb x Bi 2 Se 3 剥离薄片的电导光谱
DOI：
10.1021/acs.nanolett.8b02954
复制
发表时间：
2018
期刊：
影响因子：
10.8
通讯作者：
Vojta, T.
中科院分区：
文献类型：
--
作者：
Kurter, C.;Finck, A. D.;Huemiller, E. D.;Medvedeva, J.;Weis, A.;Atkinson, J. M.;Qiu, Y.;Shen, L.;Lee, S. H.;Vojta, T.
我们研究了薄剥离单晶中的非常规超导电性，这是一种很有前途的三维拓扑超导体候选材料，即掺Nb的BiSethrough Andreev反射光谱和磁输运。对低电阻和高电阻样品的安德列夫反射的测量都表明，零偏压附近的电导增强，而超导能隙处的电导下降。这种行为与传统的安德列夫反射的Blonder-Tinkham-Klip wijk理论不一致。我们讨论了我们的结果如何与波对对称性相一致，从而支持了Nb掺杂的BISE中存在拓扑超导的可能性。
We study unconventional superconductivity in thin exfoliated single crystals of a promising 3D topological superconductor candidate, Nb-doped BiSethrough Andreev reflection spectroscopy and magneto-transport. Measurements of Andreev reflection in low and high resistance samples both show enhanced conductance around zero bias and conductance dips at the superconducting energy gap. Such behavior is inconsistent with conventional Blonder-Tinkham-Klapwijk theory of Andreev reflection. We discuss how our results are consistent with-wave pairing symmetry, supporting the possibility of topological superconductivity in Nb-doped BiSe.