Strong superconducting proximity effect in pb-bi(2)te(3) hybrid structures.
Strong superconducting proximity effect in pb-bi(2)te(3) hybrid structures.
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Pb-Bi2Te3 混合结构中的强超导邻近效应
DOI：
10.1038/srep00339
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发表时间：
2012
影响因子：
4.6
通讯作者：
Lu, Li
中科院分区：
文献类型：
--
作者：
Qu, Fanming;Yang, Fan;Shen, Jie;Ding, Yue;Chen, Jun;Ji, Zhongqing;Liu, Guangtong;Fan, Jie;Jing, Xiunian;Yang, Changli;Lu, Li
为了研究传统超导体和拓扑绝缘体之间的界面，我们制作了Pb-Bi 2 Te 3-Pb横向和三明治结，并在低温下进行了电子输运测量。结果表明，Bi_2 Te_3与Pb之间存在强烈的超导邻近效应，在接近Pb超导温度的温度下，可沿Bi_2 Te_3薄片（100~300 nm）的厚度方向沿着产生超导电流。 此外，在Bi 2 Te 3表面上的两个Pb电极之间的横向方向上，可以在几微米上建立约瑟夫森电流。我们进一步证明了基于邻近效应诱导的超导性可以构造超导量子干涉器件。器件的临界电流具有类s波干涉和夫琅和费衍射图样。随着设计的改进，这种类型的约瑟夫森器件将为未来探索马约拉纳费米子等新现象提供试验平台。
To study the interface between a conventional superconductor and a topological insulator, we fabricated Pb-Bi2Te3-Pb lateral and sandwiched junctions, and performed electron transport measurements down to low temperatures. The results show that there is a strong superconducting proximity effect between Bi2Te3 and Pb, as that a supercurrent can be established along the thickness direction of the Bi2Te3 flakes (100~300 nm thick) at a temperature very close to the superconducting Tc of Pb. Moreover, a Josephson current can be established over several microns in the lateral direction between two Pb electrodes on the Bi2Te3 surface. We have further demonstrated that superconducting quantum interference devices can be constructed based on the proximity-effect-induced superconductivity. The critical current of the devices exhibits s-wave-like interference and Fraunhofer diffraction patterns. With improved designs, Josephson devices of this type would provide a test-bed for exploring novel phenomena such as Majorana fermions in the future.
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影响因子：
8.6
作者：
Sau, Jay D.;Lutchyn, Roman M.;Das Sarma, S.
通讯作者：
Das Sarma, S.
影响因子：
8.6
作者：
Fu, Liang;Kane, C. L.
通讯作者：
Kane, C. L.
影响因子：
3.5
作者：
Qi, Xiao-Liang;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
19.6
作者：
Wilczek, Frank
通讯作者：
Wilczek, Frank
影响因子：
3.7
作者：
DYNES, RC;FULTON, TA
通讯作者：
FULTON, TA