Topological properties and gap structure of the paired state in twisted TMD bilayers within a two-band effective model
Abstract
We present a theoretical study motivated by the recent experimental results which demonstrate superconductivity emerging from flat topological bands of twisted transition metal dichalcogenide (TMD) bilayers. To capture the non-trivial band topology of the system, we employ an effective two-band Kane-Mele-like model and substitute it with Coulomb repulsion and inter-site pairing interactions treated at the Hartree-Fock mean-field level. Assuming a real-space pairing scenario, we analyze the resulting superconducting gap symmetry and the stability of the paired state as a function of band filling and applied displacement field. Finally, we highlight the interplay between superconductivity and non-trivial topology, detailing how interaction-induced effects and the evolution of the density of states shape the resulting superconducting phase diagram.
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BibTeX
@misc{saha2026topological,
title = {{Topological properties and gap structure of the paired state in twisted TMD bilayers within a two-band effective model}},
author = {Palash Saha and Michał Zegrodnik},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21825},
eprint = {2609.21825},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21825},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Topological properties and gap structure of the paired state in twisted TMD bilayers within a two-band effective model
AU - Palash Saha
AU - Michał Zegrodnik
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21825
UR - https://arxiv.org/abs/2609.21825
AB - We present a theoretical study motivated by the recent experimental results which demonstrate superconductivity emerging from flat topological bands of twisted transition metal dichalcogenide (TMD) bilayers. To capture the non-trivial band topology of the system, we employ an effective two-band Kane-Mele-like model and substitute it with Coulomb repulsion and inter-site pairing interactions treated at the Hartree-Fock mean-field level. Assuming a real-space pairing scenario, we analyze the resulting superconducting gap symmetry and the stability of the paired state as a function of band filling and applied displacement field. Finally, we highlight the interplay between superconductivity and non-trivial topology, detailing how interaction-induced effects and the evolution of the density of states shape the resulting superconducting phase diagram.
ER -