Work

Density matrix renormalization group study of superconducting pairing near the quarter-filled Wigner crystal

Year: 2025

Type: article

Abstract: Charge ordering is often found in the phase diagram of unconventional superconductors in close proximity to the superconducting state. This has led to the suggestion that fluctuations of charge order can mediate superconducting pairing. While several mechanisms can lead to charge order, one common mechanism is the long-range Coulomb interaction, resulting in a Wigner crystal charge ordered state. For an electron density of 0.5 per site, we investigate the extended Hubbard model on the two-dimensional square lattice using exact diagonalization and density matrix renormalization group methods. Our results show that the strength of pairing decreases with the nearest-neighbor Coulomb interaction strength $V$ and remains weaker than the tendency of pairing for noninteracting electrons.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.111.155108

Authors: R. Torsten Clay, Beau A. Thompson

Institution: Mississippi State University

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Division of Materials Research

Award: REU Site: Computational Methods with applications in Materials Science