Measure the coherence length of a rhombohedral-graphene chiral Majorana wall

Measure the inelastic coherence length of a chiral Majorana domain wall in rhombohedral graphene and determine whether it exceeds the loop perimeter sufficiently to support parity-sensitive resonances.

Background

The proposed thermal interferometer relies on coherent propagation around a closed chiral-Majorana loop. Although the paper estimates the coherence requirement using a phenomenological dephasing model, it emphasizes that the relevant coherence length has not been established for rhombohedral graphene. Wall roughness, interbranch mixing, and additional low-energy modes could reduce the total coherence length even if intrinsic inelastic scattering is weak.

This problem is central to determining whether the calculated parity-dependent resonances survive in an actual device rather than only in the coherent theoretical model.

References

This estimate does not determine the inelastic coherence length, however, because wall roughness and equilibration of the RHG domain-wall modes have not yet been characterized.

— Self-calibrating thermal interferometry of vortex parity in a two-dimensional chiral superconductor  (2608.19343 - Ghosh, 19 Aug 2026) in Section 2.3, “Material scales”; Section 5.7, “Partial coherence”; Appendix “Domain of validity”