Theoretical Review Unveils Interlayer Pairing Mechanism in Bilayer Nickelate Superconductors, Highlighting Quantum Geometry’s Role in Unconventional Superconductivity

June 28, 2026

ResearchGate International

Overview

This article provides a comprehensive theoretical review of bilayer nickelate superconductors, delving into their interlayer pairing mechanism following the recent discovery of superconductivity in these materials. It emphasizes the critical role of essential physical ingredients, including quantum geometry, for exploring unconventional superconductivity, offering crucial insights into the origins of high-temperature superconductivity.

In Depth

Key Findings

This review article consolidates the theoretical progress made in bilayer nickelate superconductors since their discovery, offering a detailed analysis of their unique “interlayer pairing mechanism.” The study clearly demonstrates how fundamental physical ingredients, such as quantum geometry, contribute to understanding and exploring unconventional superconductivity in these materials.

Technical Details

Nickelate superconductors have garnered significant attention as “cuprate analogs” due to their structural and electronic similarities to copper oxide superconductors, with the hope that their superconductivity mechanism will shed light on the long-standing problem of high-temperature superconductivity. This paper examines how interactions between layers in bilayer nickelate materials contribute to electron pair formation, using various theoretical models (e.g., strong correlation electron system models, extensions of Fermi liquid theory). Particular emphasis is placed on the quantum geometric aspects, specifically how the topology of the band structure and Berry curvature might influence the symmetry of the superconducting order parameter and the behavior of the superconducting gap. This has led to a deeper understanding of the characteristics of unconventional superconductivity that cannot be fully explained by conventional BCS theory.

Background & Context

Since the discovery of high-temperature superconductors, their operating principles have remained one of the most significant unsolved problems in physics. Exploring high-temperature superconductivity in material systems other than copper oxides is crucial for discovering new physical phenomena and developing more practical superconducting materials. Recently discovered nickelate superconductors, owing to their structural and electronic resemblances to cuprates, hold the potential for a unified understanding of high-temperature superconductivity. However, much debate remains regarding their superconducting mechanism, particularly how electrons form pairs.

Strategic Significance & Outlook

This review summarizes the latest theoretical insights into the interlayer pairing mechanism of bilayer nickelate superconductors, serving as a vital guide for future experimental research and theoretical modeling. The emphasis on the role of quantum geometry offers a new perspective in unconventional superconductivity research and may ultimately provide clues for material design towards realizing room-temperature superconductivity. Advances in this field hold the potential for various technological innovations, including ultra-efficient power transmission, ultra-fast computers, and advanced medical imaging.

Source: https://www.researchgate.net/publication/381534948_Interlayer_pairing_mechanism_for_bilayer_nickelate_superconductors

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