来自Su-Schrieffer-Heeger-Hubbard模型的强大的d波超导:可能通往高温超导的途径
Hao-Xin Wang1, Yi-Fan Jiang2, Hong Yao1
1Institute for Advanced Study, Tsinghua University, Beijing 100084, China.
Science bulletin
|June 5, 2025
概括
强大的电子-声子合和哈巴德排斥可以诱导高温超导 (SC). 这项研究表明,苏-施里弗-希格尔 (SSH) 电子-声子合,结合哈巴德排斥,是实现强大的d波SC的关键.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料科学 量子材料科学
- 计算物理 计算物理
背景情况:
- 强烈排斥的最简单的哈伯德模型往往无法解释高温超导 (SC).
- 探索用于高温SC的替代显微机制对于材料科学至关重要.
- 了解不同相互作用的相互作用是发现新型超导状态的关键.
研究的目的:
- 为了研究苏-施里弗-希格 (SSH) 电子-声子合 (EPC) 和哈伯德排斥对超导的联合效应.
- 为了确定这种相互作用是否会导致高温SC.
- 阐明SSH型EPC在产生促进SC的磁相互作用中的作用.
主要方法:
- 使用最先进的密度矩阵-重规范化组 (DMRG) 模拟.
- 在一个方格格子上分析哈伯德模型,其中包含SSH电子-声波合.
- 对哈伯德排斥 (U) 和SSH EPC (λ) 的不同强度的相位图进行研究.
主要成果:
- 强大的哈伯德排斥 (U) 和温和的SSH EPC (λ) 之间的相互作用强烈地诱导d波SC.
- SSH型EPC产生有效的反铁磁自旋交换相互作用,对SC至关重要.
- 确定了一个关键的SSH EPC值 (λc = 0.1-0.2) 对于U=8t来实现d波SC.
结论:
- 强大的哈伯德U和中度SSH λ的组合为高温SC提供了一个可行的机制.
- 这一发现为酸盐中的SC提供了新的见解,并建议在其他量子材料中发现SC的途径.
- 这项研究强调了电子-声声合在实现异国情调电子状态方面的重要性.
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