Work

Antiferromagnetism and tightly bound Cooper pairs induced by kinetic frustration

Year: 2026

Type: article

Abstract: Antiferromagnetism and superconductivity are often viewed as competing orders in correlated electron systems. Here, we demonstrate that kinetic frustration in hole motion facilitates their coexistence within the square-lattice repulsive Hubbard model. Combining exact analytical solutions on tailored geometries with large-scale numerical simulations, we reveal a robust pairing mechanism: Holes on opposite sublattices behave as if they carry opposite effective charges due to spin singlet formation from kinetic frustration. This emergent property suppresses phase separation and fosters a coherent [Formula: see text]-wave superconducting channel embedded within a long-range antiferromagnetic background. Our findings establish a minimal yet broadly applicable framework for stabilizing strong-coupling superconductivity in doped Mott insulators.

Source: Proceedings of the National Academy of Sciences

DOI: 10.1073/pnas.2606433123

Authors: Yixin Zhang, Cristian D. Batista, Yang Zhang

Institutions: Peking University, University of Tennessee at Knoxville, Oak Ridge National Laboratory

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W4415137648

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