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Anomalous Josephson Effect in Topological Insulator-Based Josephson Trijunction

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arxiv 2112.08646 v1 pith:ZIIEW6LJ submitted 2021-12-16 cond-mat.supr-con cond-mat.mes-hall

Xiang Zhang , Zhaozheng Lyu , Guang Yang , Bing Li , Yan-Liang Hou , Tian Le , Xiang Wang , Anqi Wang
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Xiaopei Sun Enna Zhuo Guangtong Liu Jie Shen Fanming Qu Li Lu
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classification cond-mat.supr-concond-mat.mes-hall
keywords josephsontopologicaltrijunctionsanomalouseffectinsulator-basedmajoranatrijunction
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abstract

We studied anomalous Josephson effect (AJE) in Josephson trijunctions fabricated on Bi$_2$Se$_3$, and found that the AJE in T-shaped trijunctions significantly alters the Majorana phase diagram of the trijunctions, when an in-plane magnetic field is applied parallel to two of the three single junctions. Such a phenomenon in topological insulator-based Josephson trijunction provides unambiguous evidence for the existence of AJE in the system, and might provide an additional knob for controlling the Majorana bound states in the Fu-Kane scheme of topological quantum computation.

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