波动对密度波浪的机制
Chandan Setty1,2, Laura Fanfarillo3,4, P J Hirschfeld5
1Department of Physics, University of Florida, Gainesville, FL, USA. csetty@rice.edu.
Nature communications
|June 1, 2023
概括
强合的超导体表现出独特的配对相. 一个新的模型揭示了波动的对密度波形状态,可以过渡到超导或对密度波形阶段.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 超导理论 超导理论
背景情况:
- 弱合超导体 (BCS理论) 将库珀对的形成限制在围绕费米能量 (EF) 的狭窄能量窗口上.
- 强合超导体 (例如,酸盐,FeSe,SrTiO,冷原子冷凝) 的配对尺度 (EB) 相当于或大于EF.
- 假设cuprates中的伪间隙状态涉及波动的对密度波,但缺乏支持的微观模型.
研究的目的:
- 开发一种分析可解决的模型,用于检查强度合超导体中的配对相.
- 调查异构相互作用对这些配对阶段的影响.
- 了解现实系统中波动和远程对密度波的出现.
主要方法:
- 开发一个最小的,可分析解决的模型.
- 在强合和异型相互作用条件下对联相的分析.
- 在有限和低温下对相变的研究.
主要成果:
- 在不稳定温度 (Ti) 下发现一个不寻常的有限温度阶段,其特点是局部对相关性与非零质量中心动量,但缺乏远程顺序.
- 证明这种波动的对密度波可以在低温下凝结成均的d波超导体或对密度波状态,这取决于相互作用强度.
- 该模型为理解波动和远程对密度波提供了一个统一的框架.
结论:
- 拟议的模型成功地描述了强度合体制中的配对现象.
- 它为波动的对密度波的存在及其随后的凝结提供了微观解释.
- 这项工作统一了对强度合系统中不同配对状态的理解.
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