Nonvolatile φ<sub>₀</sub>-Memory and Symmetry Breaking in Helimagnetic Josephson Diodes
ORAL
Abstract
Chiral magnetic order in superconducting junctions enables intrinsic phase bias and broken time-reversal symmetry. We fabricate Josephson junctions from the helimagnet Cr1/3NbS2 and investigate how chiral spin textures control superconducting phase dynamics. Magnetic field training imprints persistent phase offsets (φ₀) in the junction that survive after the field is removed. The junction's transport properties seem to violate microreversibility, exhibiting direction-dependent critical currents and odd-in-field asymmetries. The diode polarity itself can be reversed by changing how magnetic fields are applied. Our results demonstrate that symmetry-protected φ₀ states in helimagnetic junctions may enable reconfigurable, nonvolatile control of supercurrent directionality.
*This work was supported by the NSF-BSF under grant DMR-2422090 and by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers. All fabrication and measurement experiments were carried out at facilities of the Materials Research Laboratory at the University of Illinois Urbana-Champaign.
–
Presenters
-
Shreyanka Sinha
- University of Illinois at Urbana-Champaign