Probing the pairing symmetry of moiré graphene superconductors
Abstract
The pairing symmetry of magic-angle moiré graphene is a fundamental question that remains unresolved. Combining experimental and theoretical inputs, we constrain the superconducting order parameters that can emerge from the incommensurate Kekulé spiral (IKS) normal state on the hole-doped side of ν= −2. Imposing the additional experimental constraint of nodal superconductivity, we are left with the task of distinguishing between singlet or triplet pairing, and of determining the d-vector in the latter case. We propose definitive tests to identify the pairing symmetry based on two classes of experiments using the response of the superconducting state to Zeeman field orientation. The first set of predictions is for spectroscopic and thermodynamic measurements sensitive to low-energy excitations near the nodes. The second set is for phase-sensitive measurements of topologically protected Andreev bound states near boundaries, whose spectroscopy is shown to provide a smoking gun signature of the pairing symmetry.
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BibTeX
@misc{biswas2026probing,
title = {{Probing the pairing symmetry of moiré graphene superconductors}},
author = {Sayak Biswas and Rajdeep Sensarma and Mohit Randeria},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.23994},
eprint = {2606.23994},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.23994},
}
RIS
TY - UNPB
TI - Probing the pairing symmetry of moiré graphene superconductors
AU - Sayak Biswas
AU - Rajdeep Sensarma
AU - Mohit Randeria
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2606.23994
UR - https://arxiv.org/abs/2606.23994
AB - The pairing symmetry of magic-angle moiré graphene is a fundamental question that remains unresolved. Combining experimental and theoretical inputs, we constrain the superconducting order parameters that can emerge from the incommensurate Kekulé spiral (IKS) normal state on the hole-doped side of ν= −2. Imposing the additional experimental constraint of nodal superconductivity, we are left with the task of distinguishing between singlet or triplet pairing, and of determining the d-vector in the latter case. We propose definitive tests to identify the pairing symmetry based on two classes of experiments using the response of the superconducting state to Zeeman field orientation. The first set of predictions is for spectroscopic and thermodynamic measurements sensitive to low-energy excitations near the nodes. The second set is for phase-sensitive measurements of topologically protected Andreev bound states near boundaries, whose spectroscopy is shown to provide a smoking gun signature of the pairing symmetry.
ER -