Global phase diagram of D-wave superconductivity in the square-lattice t-J model

• 成果类型: Article
• 署名作者: Chen, Feng; Haldane, F. D. M.; Sheng, D. N.
• 署名单位: California State University System; California State University Northridge; Princeton University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-9221
• DOI: 10.1073/pnas.2420963122
• 发表日期: 2025-03-25
• 关键词: matrix renormalization-group; valence-bond state; ORDER; physics; transitions; colloquium

摘要

The Hubbard and closely related t-J models are exciting platforms for unconventional superconductivity (SC). Through state-of-the-art density matrix renormalization group calculations using the grand canonical ensemble, we address open issues regarding the ground-state phase diagram of the extended t-J model on a square lattice in the parameter regime relevant to cuprate superconductors. On large 8-leg cylinders, we demonstrate that the pure t-J model with only nearest-neighbor hoppings and superexchange interactions, for a wide range of doping (S = 0.1 to 0.2), hosts robust d-wave superconductivity possibly coexisting with weak unidirectional pair density wave. Furthermore, a small next nearest neighbor hopping t2 suppresses pair and charge density waves, resulting in a uniform d-wave SC phase in both electron-and hole-doped cuprate model systems. Our work validates the t-J model as a proper minimum model for the emergence of superconductivity in cuprate superconductors.