金属性Néel序由不等价Hubbard层间耦合稳定
Metallic Néel order stabilized by coupling between inequivalent Hubbard layers
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中文总结 AI 辅助
本研究通过无约束Hartree-Fock近似发现，强层间耦合可使不等价掺杂Hubbard层稳定为公度Néel金属态，其费米面重构与实验吻合，揭示多层铜氧化物新物理。
中文摘要 AI 辅助
受近期对多层（$n\geq3$层）铜氧化物超导体ARPES研究的启发，我们使用无约束Hartree-Fock近似来探索两个耦合、不等价掺杂的方形晶格Hubbard层的基态相图。在解耦层极限下，轻空穴掺杂的基态通常是非公度自旋条纹态。然而，当层间耦合足够强时，条纹序相对于公度Néel有序金属变得不稳定。所得态展现出重构的费米面，在$(\pm\pi/2,\pm\pi/2)$处有空穴口袋，其性质与实验中观察到的相似。我们的结果说明了多层铜氧化物中层间耦合可能产生定性上的新物理。
英文摘要
Inspired by recent ARPES studies on multilayer ($n\geq3$ layers) cuprate superconductors, we use the unrestricted Hartree-Fock approximation to explore the ground-state phase diagram of two coupled, inequivalently doped square-lattice Hubbard layers. In the decoupled-layer limit, the lightly hole-doped ground state is typically an incommensurate spin-stripe state. However, with sufficiently strong interlayer coupling, stripe order is destabilized relative to a commensurate Néel-ordered metal. The resulting state exhibits a reconstructed Fermi surface with hole pockets centered at $(\pmπ/2,\pmπ/2)$ that are similar in character to those seen in experiments. Our results illustrate the qualitatively new physics that can arise from interlayer coupling in multilayer cuprates.
发表机构
- Institute for Advanced Study in Physics, Zhejiang University（浙江大学前沿物理研究院）
- Leinweber Institute for Theoretical Physics, Stanford University（斯坦福大学莱因韦伯理论物理研究所）
- Department of Applied Physics, Stanford University（斯坦福大学应用物理系）
- Institute for Advanced Study, Tsinghua University（清华大学高等研究院）
- Department of Physics, Stanford University（斯坦福大学物理系）
机构由 AI 辅助整理，请以论文原文为准。
