Demonstrate local contour writing around a single vortex

Demonstrate arbitrary submicron-to-micron-scale closed-loop writing and reconfiguration of a chiral domain wall in rhombohedral graphene so that matched contours can place the same Abrikosov vortex inside or outside the loop at fixed magnetic field.

Background

The fixed-field parity-switch protocol requires a rewritable closed domain wall whose contour can be deformed across a known, pinned vortex while preserving the bulk state, magnetic field, contact settings, and approximately the same perimeter. Existing work cited in the paper demonstrates deterministic chiral-domain reconfiguration, but not the specific local contour control required for this interferometer.

Achieving this capability would provide the strongest discrimination against false positives caused by edge-vortex hybridization and would remove ambiguities associated with field-driven vortex entry.

References

Ref. establishes deterministic ultra-low-current reconfiguration of chiral domains, but not arbitrary micron-scale contour writing around an individual Abrikosov vortex.

— Self-calibrating thermal interferometry of vortex parity in a two-dimensional chiral superconductor  (2608.19343 - Ghosh, 19 Aug 2026) in Section 2.2, “Thermal readout of a closed edge”; Section 5.3, “Fixed-field geometric parity switch”; Appendix “Domain of validity”