Ac Josephson effect in Corbino-geometry Josephson junctions constructed on Bi2Te3 surface

• Published in: Chinese physics B Vol. 31; no. 10; pp. 312 - 316
• Main Authors: Zhang, Yunxiao, Lyu, Zhaozheng, Wang, Xiang, Zhuo, Enna, Sun, Xiaopei, Li, Bing, Shen, Jie, Liu, Guangtong, Qu, Fanming, Lü, Li
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.10.2022; 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; School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China%Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China; Hefei National Laboratory,Hefei 230088,China; Songshan Lake Materials Laboratory,Dongguan 523808,China%Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
• Subjects: ac Josephson effect; Corbino-geometry Josephson junction; fractional Shapiro steps; topological insulator; topological insulator; ac Josephson effect; fractional Shapiro steps; Corbino-geometry Josephson junction
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ac89d4

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 Bi2Te3 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.