论文标题
在有限温度下的几个特里米翁系统中的非常规配对
Unconventional pairing in few-fermion systems at finite temperature
论文作者
论文摘要
研究了限制在一维谐波陷阱中的费米子颗粒的两组分组混合物。平衡和不平衡系统的属性通过精确的对角度方法进行系统地探索，重点是有限温度效应。使用单粒子密度分布，根据噪声相关性分析了特定的非经典配对相关性 - 在具有超冷原子的最新实验中可以直接访问数量。结果表明，随着温度的升高，托管Fulde-ferrel-larkin-ovchinnikov的任何不平衡系统将跨界与标准的bardeen-cooper-schrieffer配对，以零净动量的结果对。通过对具有不同失衡的系统进行计算，确定了相图上两个阶段之间的近似边界。
Attractively interacting two-component mixtures of fermionic particles confined in a one-dimensional harmonic trap are investigated. Properties of balanced and imbalanced systems are systematically explored with the exact diagonalization approach, focusing on the finite-temperature effects. Using single- and two-particle density distributions, specific non-classical pairing correlations are analyzed in terms of the noise correlations -- quantity directly accessible in state-of-the-art experiments with ultra-cold atoms. It is shown that along with increasing temperature, any imbalanced system hosting Fulde-Ferrel-Larkin-Ovchinnikov pairs crossovers to a standard Bardeen-Cooper-Schrieffer one characterized by zero net momentum of resulting pairs. By performing calculations for systems with different imbalances, the approximate boundary between the two phases on a phase diagram is determined.
