Andreev reflection at the edge of a two-dimensional semimetal

作者：Kononov A^*; Egorov S V; Kvon Z D; Mikhailov N N; Dvoretsky S A; Deviatov E V

来源：Physical Review B, 2016, 93(4): 041303.

DOI：10.1103/PhysRevB.93.041303

We investigate electron transport through the interface between a niobium superconductor and the edge of a two-dimensional semimetal, realized in a 20-nm-wide HgTe quantum well. Experimentally, we observe that typical behavior of a single Andreev contact is complicated by both a pronounced zero-bias resistance anomaly and shallow subgap resistance oscillations with 1/n periodicity. These results are demonstrated to be independent of the superconducting material and should be regarded as specific to a two-dimensional semimetal in proximity with a superconductor. We interpret these effects to originate from the Andreev-like correlated process at the edge of a two-dimensional semimetal.

• 出版日期2016-1-26