Thermal Hall tomography of superconducting topology in rhombohedral graphene
Abstract
Chiral superconductors should carry Majorana modes along their edges, yet three decades of work on candidate materials have not measured the integer that counts them. Rhombohedral graphene offers a new route, because its superconductivity coexists with magnetic domains that can be imaged and rewritten. Here we show how heat transport can read this integer and test it against the domain pattern. Warping and finite pair momentum can close the excitation gap while the band Chern number stays fixed. An exact two-band thermal kernel shows how quantization is then lost and bounds the plateau error when the gap survives. Real-space calculations with disorder show that the integer survives disorder several times larger than the gap, because a mobility gap remains. Bogoliubov pockets instead turn the bulk into a heat conductor, and disorder does not restore quantization. Time-reversed domains should show opposite plateaux, and with ideal contacts a wall between them should carry twice either plateau. In microscopic calculations, a written wall carries this number of Majorana channels even when its core is metallic. Writing, moving and erasing such walls would test superconducting topology, its link to magnetism, and protected heat flow in one device.
Related
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BibTeX
@misc{ghosh2026thermal,
title = {{Thermal Hall tomography of superconducting topology in rhombohedral graphene}},
author = {Kumar Ghosh},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.12586},
eprint = {2608.12586},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.12586},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Thermal Hall tomography of superconducting topology in rhombohedral graphene
AU - Kumar Ghosh
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2608.12586
UR - https://arxiv.org/abs/2608.12586
AB - Chiral superconductors should carry Majorana modes along their edges, yet three decades of work on candidate materials have not measured the integer that counts them. Rhombohedral graphene offers a new route, because its superconductivity coexists with magnetic domains that can be imaged and rewritten. Here we show how heat transport can read this integer and test it against the domain pattern. Warping and finite pair momentum can close the excitation gap while the band Chern number stays fixed. An exact two-band thermal kernel shows how quantization is then lost and bounds the plateau error when the gap survives. Real-space calculations with disorder show that the integer survives disorder several times larger than the gap, because a mobility gap remains. Bogoliubov pockets instead turn the bulk into a heat conductor, and disorder does not restore quantization. Time-reversed domains should show opposite plateaux, and with ideal contacts a wall between them should carry twice either plateau. In microscopic calculations, a written wall carries this number of Majorana channels even when its core is metallic. Writing, moving and erasing such walls would test superconducting topology, its link to magnetism, and protected heat flow in one device.
ER -