Ac Josephson effect in Corbino-geometry Josephson junctions constructed on Bi_(2)Te_(3) surface  

作　　者：Yunxiao Zhang Zhaozheng Lyu Xiang Wang Enna Zhuo Xiaopei Sun Bing Li Jie Shen Guangtong Liu Fanming Qu Li Lu 张云潇;吕昭征;王翔;卓恩娜;孙晓培;李冰;沈洁;刘广同;屈凡明;吕力(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Hefei National Laboratory,Hefei 230088,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China [4]Hefei National Laboratory,Hefei 230088,China

出　　处：《Chinese Physics B》2022年第10期278-282,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 92065203, 11527806, 12074417, 11874406, 11774405, and E2J1141);the National Basic Research Program of China (Grant Nos. 2016YFA0300601, 2017YFA0304700, and 2015CB921402);the Strategic Priority Research Program B of the Chinese Academy of Sciences (Grant Nos. XDB33010300, DB28000000, and XDB07010100);the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD302600);Synergetic Extreme Condition User Facility (SECUF) sponsored by the National Development and Reform Commission, China。

摘　　要：Recently, a Corbino-geometry type of Josephson junction constructed on the surface of topological insulators has been proposed for hosting and braiding Majorana zero modes. As a first step to test this proposal, we successfully fabricated Corbino-geometry Josephson junctions(JJs) on the surface of Bi_(2)Te_(3) flakes. Ac Josephson effect with fractional Shapiro steps was observed in the Corbino-geometry JJs while the flux in the junction area was quantized. By analyzing the experimental data using the resistively shunted Josephson junction model, we found that the Corbino-geometry JJs exhibit a skewed current-phase relation due to its high transparency. The results suggest that Corbino-geometry JJs constructed on the surface of topological insulators may provide a promising platform for studying Majorana-related physics.

关 键 词：Corbino-geometry Josephson junction topological insulator ac Josephson effect fractional Shapiro steps 

分 类 号：O469[理学—凝聚态物理]