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Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal Cd3As2-mediated asymmetric SQUIDs

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arxiv 2406.03598 v2 pith:XF3FKG3T submitted 2024-06-05 cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci

Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal Cd3As2-mediated asymmetric SQUIDs

classification cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci
keywords effectjosephsonsuperconductingasymmetriccd3as2diodediracreversal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A zero-magnetic-field Josephson diode effect (JDE) is observed in an asymmetric superconducting quantum interference device (SQUID) mediated by Dirac semimetal Cd3As2. We argue that a phase coupling between the surface and bulk superconducting channels, a unique phenomenon recently identified in the observations of fractional Josephson effect and Leggett modes in Cd3As2, can break time reversal symmetry and therefore give rise to the zero-field JDE. Our results are anticipated to have important implications in superconducting electronic circuit applications.

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