Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi mathvariant="normal">C</mml:mi> <mml:msub> <mml:mi mathvariant="normal">d</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mi mathvariant="normal">A</mml:mi> <mml:msub> <mml:mi mathvariant="normal">s</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> mediated asymmetric SQUIDs
Wenlong Yu, Joseph J. Cuozzo, Keshab Sapkota, Enrico Rossi, David Rademacher, Tina M. Nenoff, W. Pan
Abstract
A zero-magnetic-field Josephson diode effect (JDE) is observed in an asymmetric superconducting quantum interference device (SQUID) mediated by Dirac semimetal $\mathrm{C}{\mathrm{d}}_{3}\mathrm{A}{\mathrm{s}}_{2}$. 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 $\mathrm{C}{\mathrm{d}}_{3}\mathrm{A}{\mathrm{s}}_{2}$, 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.