Year: 2014
Type: article
Abstract: Using a recently developed renormalization group method for fermionic superfluids, we determine conditions for $d$-wave superconductivity in the ground state of the two-dimensional Hubbard model at moderate interaction strength, and we compute the pairing gap in the superconducting regime. A pairing instability signaled by a divergent flow in the Cooper channel leads to a superconducting state in all studied cases. The next-to-nearest-neighbor hopping ${t}^{\ensuremath{'}}$ plays a crucial role in the competition between antiferromagnetism and superconductivity. A sizable ${t}^{\ensuremath{'}}$ is necessary to obtain a sizable pairing gap.
Source: Physical Review B
Authors: Andreas Eberlein, Walter Metzner
Institution: Max Planck Institute for Solid State Research
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2026188647