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arXiv 2209.05151cond-mat.supr-concond-mat.quant-gascond-mat.str-el
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二维空穴掺杂哈伯德模型超导圆顶在干费米海中的移动:过掺杂区d波配对的增强

Shifting superconducting dome of two-dimensional hole-doped Hubbard model by a dry Fermi sea: enhanced d-wave pairing in the overdoped regime

Mi Jiang

摘要:

基于无限层镍酸盐超导体电子能带结构中存在极小电子袋的现象,系统地研究了小占据率导带(干费米海)对二维哈伯德模型超导特性的影响.我们的动态集群量子Monte Carlo计算表明,这种额外的干金属层,转移SC圆顶的相关Hubbard层对过掺杂制度,即$d$波SC可以增强(抑制)在过掺杂(欠掺杂)制度的不寻常的影响。同时,赝能隙(PG)交叉线也转移到相同的较高掺杂区。我们的分析揭示了有效的配对相互作用,对场的磁化率,反铁磁自旋涨落在潜在的非单调物理的相互作用。我们假设的SC圆顶移动的物理图像的近藤型电子空穴绑定的情况下,一个干的附加导带。我们的调查提供了宝贵的新的见解,通过外部干带调谐SC属性。

英文摘要:

Motivated by the presence of an extremely small electron pocket in the electronic band structure of infinite-layer (IL) nickelate superconductors, we systematically explore the superconducting (SC) properties of a two-dimensional Hubbard model influenced by an additional conduction band with small occupancy (dry Fermi sea). Our dynamic cluster quantum Monte Carlo calculations demonstrated the unusual impact of this additional dry metallic layer, which shifts the SC dome of the correlated Hubbard layer towards the overdoped regime, namely the $d$-wave SC can be enhanced (suppressed) in the overdoped (underdoped) regime. Simultaneously, the pseudogap (PG) crossover line shifts to the same higher doping regime as well. Our analysis revealed the interplay of the effective pairing interaction, pair-field susceptibility, and antiferromagnetic spin fluctuation in the underlying non-monotonic physics. We postulate on the physical picture of SC dome shift in terms of the Kondo-type electron-hole binding in the case of a dry additional conduction band. Our investigation provided valuable new insights on tuning the SC properties via external dry bands.

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