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arXiv 1410.1111cond-mat.mes-hall
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三维拓扑绝缘体HgTe中约瑟夫森结的非正弦电流-相位关系

Non-sinusoidal current-phase relationship in Josephson junctions from the 3D topological insulator HgTe

Ilya Sochnikov, Luis Maier, Christopher A. Watson, John R. Kirtley, Charles Gould, Grigory Tkachov, Ewelina M. Hankiewicz, Christoph Brüne, Hartmut Buhmann, Lau… 展开作者

Ilya Sochnikov, Luis Maier, Christopher A. Watson, John R. Kirtley, Charles Gould, Grigory Tkachov, Ewelina M. Hankiewicz, Christoph Brüne, Hartmut Buhmann, Laurens W. Molenkamp, Kathryn A. Moler

摘要:

利用超导量子干涉仪(SQUID)显微镜研究了三维拓扑绝缘体碲化汞(3D-HgTe)约瑟夫森结的电流-相位关系。我们发现明显的偏态的碲化汞结的CPRs的长度范围从200 nm到600 nm。偏度表明约瑟夫森电流主要由具有高透射率的Andreev束缚态携带,并且偏度在长于平均自由程的结中持续存在的事实表明,该效应可能与HgTe表面中Andreev束缚态的螺旋性质有关。

英文摘要:

We use Superconducting QUantum Interference Device (SQUID) microscopy to characterize the current-phase relation (CPR) of Josephson Junctions from 3-dimentional topological insulator HgTe (3D-HgTe). We find clear skewness in the CPRs of HgTe junctions ranging in length from 200 nm to 600 nm. The skewness indicates that the Josephson current is predominantly carried by Andreev bound states with high transmittance, and the fact that the skewness persists in junctions that are longer than the mean free path suggests that the effect may be related to the helical nature of the Andreev bound states in the surface of HgTe.

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