在有限温度下的t-t^{'}-J模型的相图,d波超导和伪间隙
Dai-Wei Qu1,2, Qiaoyi Li2,3, Shou-Shu Gong4,5
1<a href="https://ror.org/01kv3wg35">Kavli Institute for Theoretical Sciences</a>, University of Chinese Academy of Sciences, Beijing 100190, China.
Physical review letters
|January 3, 2025
概括
在2D t-t^{中发现了强大的d波超导.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
- 计算物理 计算物理
背景情况:
- 2D t-t^{'}-J 模型是理解 cuprates 中高温超导的基本模型.
- 之前使用密度矩阵重规范化组 (DMRG) 的研究表明,在基本状态下强大的d波超导 (SC) 顺序.
- 关于d波SC对正 (用电子合剂) 和负 (用孔合剂) t^{'}/t比的稳定性存在争论.
研究的目的:
- 研究二维t-t^{'}-J模型的有限温度相位图,特别关注d波超导顺序.
- 解决关于d波SC在不同兴奋剂制度 (t^{'}/t > 0和t^{'}/t < 0) 中稳定的辩论.
- 为了比较模型的相位图与铜材料的相位图.
主要方法:
- 使用了最先进的热张力网络方法.
- 计算了直至W=6.6宽度的气的相位图.
- 扩展计算到低温,达到T/J0.06.06.
主要成果:
- 对于t^{'}/t > 0 (用电子杂的侧面),确定了一个状的SC模式,其d波配对灵敏度在T_{c}^{*} (最大~0.15J) 以下.
- 在T_{c}^{*}以上和T^{*}以下被抑制的磁性易感性表明了伪间隙 (PG) 行为.
- 对于t^{'}/t < 0 (孔化侧面),发现配对相关性较弱,尽管在PG模式中观察到一个节点-反节点结构,与孔化酸相一致.
结论:
- 热张量网络方法为t-t^{'}-J模型提供了准确的有限温度相位图.
- 该研究突出了t-t^{'}-J模型和有限温度的酸盐之间的相似之处和差异.
- 这些发现为强烈相关的电子系统的复杂行为提供了独特的见解.
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