Pairing from repulsive interactions in twisted WSe2 from functional renormalization
Abstract
Motivated by the observation of superconductivity in twisted bilayer WSe2 over an extended range of displacement fields, reaching from the correlated insulator down to zero field, we analyze the correlated electron phases of this system at hole filling ν= −1 and twist angle 3.65∘ using Hartree--Fock, random phase approximation, and functional renormalization group calculations. We derive a continuum model with gate-screened Coulomb interaction from first principles and compare its instabilities to those of a realistic three-orbital Wannier model with a Hubbard interaction and an artificial single-orbital Hubbard model. In both cases, we find a superconducting instability of mixed d-wave singlet and p-wave triplet character, arising adjacent to inter-valley-coherent spin-density-wave order in the phase diagram spanned by displacement field and interaction strength. Our additional analysis of the pairing mechanism points to inter-valley coherent spin fluctuations as the pairing glue. The extent of the pairing regime and the associated critical temperatures depend on the model input, and we trace differences to the interaction range entering the projected interaction. Within the continuum model, the gate-screened Coulomb interaction yields pairing down to zero displacement field, bringing theory into agreement with experiment.
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BibTeX
@misc{braun2026pairing,
title = {{Pairing from repulsive interactions in twisted WSe2 from functional renormalization}},
author = {Hannes Braun and Dumitru Călugăru and Pietro M. Bonetti and Haoyu Hu and Yan Zhang and Yi Jiang and Quansheng Wu and Kin Fai Mak and Jie Shan and B. Andrei Bernevig and Michael M. Scherer and Laura Classen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.17222},
eprint = {2610.17222},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.17222},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Pairing from repulsive interactions in twisted WSe2 from functional renormalization
AU - Hannes Braun
AU - Dumitru Călugăru
AU - Pietro M. Bonetti
AU - Haoyu Hu
AU - Yan Zhang
AU - Yi Jiang
AU - Quansheng Wu
AU - Kin Fai Mak
AU - Jie Shan
AU - B. Andrei Bernevig
AU - Michael M. Scherer
AU - Laura Classen
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.17222
UR - https://arxiv.org/abs/2610.17222
AB - Motivated by the observation of superconductivity in twisted bilayer WSe_2 over an extended range of displacement fields, reaching from the correlated insulator down to zero field, we analyze the correlated electron phases of this system at hole filling ν= −1 and twist angle 3.65^∘ using Hartree--Fock, random phase approximation, and functional renormalization group calculations. We derive a continuum model with gate-screened Coulomb interaction from first principles and compare its instabilities to those of a realistic three-orbital Wannier model with a Hubbard interaction and an artificial single-orbital Hubbard model. In both cases, we find a superconducting instability of mixed d-wave singlet and p-wave triplet character, arising adjacent to inter-valley-coherent spin-density-wave order in the phase diagram spanned by displacement field and interaction strength. Our additional analysis of the pairing mechanism points to inter-valley coherent spin fluctuations as the pairing glue. The extent of the pairing regime and the associated critical temperatures depend on the model input, and we trace differences to the interaction range entering the projected interaction. Within the continuum model, the gate-screened Coulomb interaction yields pairing down to zero displacement field, bringing theory into agreement with experiment.
ER -