Superpotential enhanced superconductivity and robust stiffness shaped by quantum geometry
Abstract
Enhancing superconductivity through material design is a central goal in quantum materials research. Moiré engineering, where twisting stacked layers creates long-wavelength modulations and flat bands, amplifies electronic correlations and raises the superconducting critical temperature T c , but is largely confined to van der Waals materials with limited tunability. Here we explore an alternative: imposing artificial superpotentials on homogeneous systems to engineer flat minibands. We show that a periodic superpotential in a two-dimensional system enhances superconductivity by reconstructing electronic bands and creating regions of large density of states, substantially increasing T c . Unlike conventional flat-band systems, where superfluid stiffness arises solely from quantum geometry, a modulated system also inherits kinetic energy from filled minibands below the Fermi level, coexisting with a positive quantum geometric contribution to yield finite, robust stiffness. The resulting state remains resilient against weak to moderate disorder. These findings establish superlattice engineering as a tunable route to enhanced superconductivity beyond twist-based moiré systems, and a promising platform for next-generation superconductors.
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BibTeX
@article{bauch2026superpotential,
title = {{Superpotential enhanced superconductivity and robust stiffness shaped by quantum geometry}},
author = {Thilo Bauch and Floriana Lombardi and Goetz Seibold},
journal = {Communications Physics},
year = {2026},
month = oct,
doi = {10.1038/s42005-026-02905-z},
url = {https://www.nature.com/articles/s42005-026-02905-z},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Superpotential enhanced superconductivity and robust stiffness shaped by quantum geometry
AU - Thilo Bauch
AU - Floriana Lombardi
AU - Goetz Seibold
PY - 2026
DA - 2026/10/02
JO - Communications Physics
DO - 10.1038/s42005-026-02905-z
UR - https://www.nature.com/articles/s42005-026-02905-z
AB - Enhancing superconductivity through material design is a central goal in quantum materials research. Moiré engineering, where twisting stacked layers creates long-wavelength modulations and flat bands, amplifies electronic correlations and raises the superconducting critical temperature T c , but is largely confined to van der Waals materials with limited tunability. Here we explore an alternative: imposing artificial superpotentials on homogeneous systems to engineer flat minibands. We show that a periodic superpotential in a two-dimensional system enhances superconductivity by reconstructing electronic bands and creating regions of large density of states, substantially increasing T c . Unlike conventional flat-band systems, where superfluid stiffness arises solely from quantum geometry, a modulated system also inherits kinetic energy from filled minibands below the Fermi level, coexisting with a positive quantum geometric contribution to yield finite, robust stiffness. The resulting state remains resilient against weak to moderate disorder. These findings establish superlattice engineering as a tunable route to enhanced superconductivity beyond twist-based moiré systems, and a promising platform for next-generation superconductors.
SN - 2399-3650
ER -