Mechanism of superconductivity in the Hubbard model at intermediate interaction strength

被引：13

作者：

Dong, Xinyang ^{[1
]}

Del Re, Lorenzo ^{[2
,3
]}

Toschi, Alessandro ^{[4
]}

Gull, Emanuel ^{[1
]}

机构：

[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[2] Georgetown Univ, Dept Phys, Washington, DC 20057 USA

[3] Max Planck Inst Solid State Res, Correlated Phases Quantum Mat Res Grp, D-70569 Stuttgart, Germany

[4] Tech Univ Wien, Inst Solid State Phys, A-1040 Vienna, Austria

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2022年 / 119卷 / 33期

基金：

奥地利科学基金会;

关键词：

Superconductivity; Strongly correlated system; Spin fluctuation theory; D-WAVE SUPERCONDUCTIVITY; PAIRING INTERACTION; SPIN;

D O I：

10.1073/pnas.2205048119

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We study the fluctuations responsible for pairing in the d-wave superconducting state of the two-dimensional Hubbard model at intermediate coupling within a cluster dynamical mean-field theory with a numerically exact quantum impurity solver. By analyzing how momentum- and frequency-dependent fluctuations generate the d-wave superconducting state in different representations, we identify antiferromagnetic fluctuations as the pairing glue of superconductivity in both the underdoped and the overdoped regime. Nevertheless, in the intermediate coupling regime, the predominant magnetic fluctuations may differ significantly from those described by conventional spin fluctuation theory.

引用

页数：6

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