强关联掺杂体系中的涌现对密度波与非相干金属态
Emergent Pair Density Wave and Incoherent Metallic State in a Strongly Correlated Doped System
- Indian Institute of Technology Kharagpur（印度理工学院卡拉格普尔分校）
- Kazi Nazrul University（卡齐·纳兹鲁尔大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究人员在slave-rotor平均场框架下，揭示强关联掺杂体系中反铁磁与d波超导相互作用可涌现对密度波，且体系随参数演化出现相干到非相干金属的转变，明确了不同区域的准粒子特征。
AI中文摘要：
我们在slave-rotor平均场框架内研究由反铁磁性（AFM）与单重态d波超导性（SC）相互作用驱动的某一态的动力学涌现。通过将电子分解为电荷与自旋自由度，该形式理论可描述超出传统平均场方法的强关联效应。研究发现，在AFM与SC的共存区域会动力学涌现出PDW序；关联效应显著修改了AFM-SC共存区域，导致四临界点发生系统性偏移。对AFM、SC、PDW序参量以及表征电荷相干性的转子凝聚振幅φ随掺杂与温度的演化研究表明，随着相干准粒子谱权重的抑制，体系会发生从相干金属到非相干金属的 crossover。此外，在AFM +（φ≠0）区域，相干准粒子能带与非相干哈伯德型激发共存；而在AFM +（φ=0）区域，仅存非相干谱特征。SC相呈现与d波配对一致的节点准粒子。
英文摘要：
We investigate the dynamical emergence of a state driven by the interplay between antiferromagnetism (AFM) and singlet $d$-wave superconductivity (SC) within a slave-rotor mean-field framework. By decomposing the electron into charge and spin degrees of freedom, the formalism captures strong-correlation effects beyond conventional mean-field approaches. A PDW order is found to emerge dynamically in the coexistence region of AFM and SC. The AFM-SC coexistence region is significantly modified with correlation, leading to a systematic shift of the tetra-critical point. The doping and temperature evolution of the AFM, SC, and PDW order parameters, together with the rotor condensate amplitude $ϕ$, which characterizes charge coherence, shows a crossover from a coherent to an incoherent metal with the suppression of coherent quasi-particle spectral weight. Moreover, in the AFM + $(ϕ\neq 0)$ region, coherent quasi-particle bands coexist with incoherent Hubbard-like excitations, whereas only incoherent spectral features survive in the AFM + $(ϕ= 0)$ regime. The SC phase exhibits nodal quasi-particles consistent with $d$-wave pairing.
