Volume 144, Number 5, December 2023
|Number of page(s)
|Condensed matter and materials physics
|20 December 2023
Constraint relations for superfluid weight and pairings in a chiral flat band superconductor
Université Grenoble Alpes, CNRS, Institut NEEL - F-38042 Grenoble, France
Received: 31 July 2023
Accepted: 17 November 2023
Within ten years, flat band (FB) superconductivity has gained a huge interest for its remarkable features and connection to quantum geometry. We investigate the superconductivity in a FB system whose orbitals are inequivalent and in which the gap and the quantum metric are tunable. The key feature of the present theoretical study is to show a unique and simple constraint relation that pairings obey. Furthermore, pairings and superfluid weight in partially filled FB are shown to be controlled by those of the half-filled lattice. We argue that the geometry of the lattice or the complexity of the hopping terms have no impact on the features revealed in this work as far as the system is bipartite.
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