Superconductivity in the two-dimensional t-t '-Hubbard model

Article

关键词: D-WAVE SUPERCONDUCTIVITY;    EQUATION;   

DOI  :  10.1103/PhysRevB.89.035126

来源: SCIE

【 摘 要 】

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' plays a crucial role in the competition between antiferromagnetism and superconductivity. A sizable t' is necessary to obtain a sizable pairing gap.

【 授权许可】

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