论文标题
高维的波动和伪gaudin-yang费米气体中的伪随
Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases
论文作者
论文摘要
伪PSEUDOGAP是在高相关系统（例如高$ t _ {\ rm c} $超导体，超电原子和核物理学）中无处不在的现象。虽然已知在低维系统中增强了诱导伪模的配对波动，但在最基本的1D模型之一（即Gaudin-Yang模型）中，这种效果尚未得到很好的探索。在这项工作中，我们表明，使用图形方法可以在该系统的单粒子激发中可见伪PAP的效应。费米子单粒子光谱显示出从双粒子色散到伪PSEUDOGAP状态的独特交叉，随着有限温度下的有吸引力的相互作用和数量密度增加。令人惊讶的是，即使在出现伪gap的区域，我们与最近的量子蒙特卡洛和复杂的兰格文的结果相同的热力学量结果也与最近的量子蒙特卡洛和复杂的兰格文的结果非常吻合。
Pseudogap is a ubiquitous phenomenon in strongly correlated systems such as high-$T_{\rm c}$ superconductors, ultracold atoms and nuclear physics. While pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one of the most fundamental 1D models, that is, Gaudin-Yang model. In this work, we show that the pseudogap effect can be visible in the single-particle excitation in this system using a diagrammatic approach. Fermionic single-particle spectra exhibit a unique crossover from the double-particle dispersion to pseudogap state with increasing the attractive interaction and the number density at finite temperature. Surprisingly, our results of thermodynamic quantities in unpolarized and polarized gases show an excellent agreement with the recent quantum Monte Carlo and complex Langevin results, even in the region where the pseudogap appears.
