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

作者：Yunxiao Zhang, Zhaozheng Lyu, Xiang Wang, Enna Zhuo, Xiaopei Sun, Bing Li, Jie Shen, Guangtong Liu, Fanming Qu, Lü Li · 发表于：Chinese Physics B · 年份：2022 · DOI：10.1088/1674-1056/ac89d4 · 被引用次数：6 · 研究领域：Topological Materials and Phenomena、Quantum and electron transport phenomena、Quantum many-body systems

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.