Establish the topological character of oppositely chiral rhombohedral-graphene domains

Establish that oppositely chiral superconducting domains in rhombohedral graphene carry opposite Bogoliubov–de Gennes Chern numbers, thereby validating the assumed chiral domain wall with mode count \(N=|C_{\rm out}-C_{\rm in}|\).

Background

The interferometer assumes that the experimentally observed reversal of chirality between rhombohedral-graphene domains corresponds to a reversal of the BdG Chern number. That identification is needed to infer the number of co-propagating Majorana modes on the domain wall and to interpret the open-contact thermal-conductance plateau as a bulk-topology calibration.

The paper treats this topological identification as an assumption rather than an established experimental fact.

References

In particular, applying the $+C/-C$ wall construction to the reconfigurable RHG domains assumes that the opposite chiral domains also carry opposite BdG Chern numbers; present domain imaging establishes chirality reversal but not this topological identification.

— Self-calibrating thermal interferometry of vortex parity in a two-dimensional chiral superconductor  (2608.19343 - Ghosh, 19 Aug 2026) in Appendix “Domain of validity”