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.
@article{arxiv.2406.03598,
title = {Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal Cd3As2-mediated asymmetric SQUIDs},
author = {W. Yu and J. J. Cuozzo and K. Sapkota and E. Rossi and D. X. Rademacher and T. M. Nenoff and W. Pan},
journal= {arXiv preprint arXiv:2406.03598},
year = {2024}
}