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http://dx.doi.org/10.9714/psac.2022.24.4.011

Numerical study of topological SQUIDs  

Soohong, Choi (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST))
Yeongmin, Jang (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST))
Sara, Arif (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST))
Yong-Joo, Doh (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST))
Publication Information
Progress in Superconductivity and Cryogenics / v.24, no.4, 2022 , pp. 11-15 More about this Journal
Abstract
We conducted numerical calculations to obtain the critical current as a function of the magnetic flux through the topologically trivial and non-trivial superconducting quantum interference devices (SQUIDs), with varying the capacitive and inductive couplings of Josephson junctions (JJs). Our calculation results indicate that a nontrivial SQUID is almost indistinguishable from trivial SQUID, considering the effective capacitance coupling. When the SQUID contains 2π- and 4π-periodic supercurrents, the periodicity of the current-flux relation can be distinguished from the purely trivial or nontrivial SQUID cases, and its difference is sensitive to the relative ratio between the topologically trivial and nontrivial supercurrents. We believe that our calculation results would provide a practical guide to quantitatively measure the portion of the topologically nontrivial supercurrents in experiments.
Keywords
superconducting quantum interference device; josephson junction; topological SQUID; majorana bound state; topological supercurrent;
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