Tunable Chern superconductivity of PtBi2 in slab geometry
Abstract
Recent experiments indicate that PtBi2 is a Weyl semimetal whose surfaces become topological superconductors with i-wave gap symmetry at low temperature. The bulk hosts 12 Weyl cones while in the superconducting state each of the two surfaces hosts in addition 6 Majorana cones. We study a simplified model in a slab geometry, where the finite thickness gaps out the bulk Weyl cones and leaves the surface Majorana cones as the low-energy degrees of freedom. We identify two competing mechanisms that gap these cones: inter-cone hybridization opens a trivial gap, whereas a Zeeman field opens a nontrivial one. In the nontrivial regime, chiral Majorana edge modes connect the gapped cones. We determine their wavefunction profile and relate it to the momentum-space distribution of the cones. Mapping out the phase diagram, we find both trivial and nontrivial regions in the quasi-two-dimensional limit.
Related
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BibTeX
@misc{ketmaier2026tunable,
title = {{Tunable Chern superconductivity of PtBi$_2$ in slab geometry}},
author = {Luca Ketmaier and Jeroen van den Brink and Ion Cosma Fulga},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03867},
eprint = {2609.03867},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03867},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Tunable Chern superconductivity of PtBi_2 in slab geometry
AU - Luca Ketmaier
AU - Jeroen van den Brink
AU - Ion Cosma Fulga
PY - 2026
DA - 2026/09/03
PB - arXiv
DO - 10.48550/arxiv.2609.03867
UR - https://arxiv.org/abs/2609.03867
AB - Recent experiments indicate that PtBi_2 is a Weyl semimetal whose surfaces become topological superconductors with i-wave gap symmetry at low temperature. The bulk hosts 12 Weyl cones while in the superconducting state each of the two surfaces hosts in addition 6 Majorana cones. We study a simplified model in a slab geometry, where the finite thickness gaps out the bulk Weyl cones and leaves the surface Majorana cones as the low-energy degrees of freedom. We identify two competing mechanisms that gap these cones: inter-cone hybridization opens a trivial gap, whereas a Zeeman field opens a nontrivial one. In the nontrivial regime, chiral Majorana edge modes connect the gapped cones. We determine their wavefunction profile and relate it to the momentum-space distribution of the cones. Mapping out the phase diagram, we find both trivial and nontrivial regions in the quasi-two-dimensional limit.
ER -