双组分费米混合物的准粒子比热：原子163Dy-40K混合物
Thermodynamic Signatures of Phase Separation in Mass Imbalanced Fermi Mixtures: Superfluid Density of States and Quasiparticle Specific Heat in the 163Dy 40K Atomic Mixture
- Department of Physics, Faculty of Basic Sciences, Shahed University（沙赫德大学基础科学学院物理系）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究超冷费米气体中质量不平衡双组分费米混合物，用平均场理论在局部密度近似下，考虑费什巴赫共振诱导的s波配对及相平衡条件，研究相互作用强度和质量比对相图、超流态密度和准粒子比热的影响，揭示质量不对称配对的热特征。
AI中文摘要：
超冷费米气体可进入正常超流相分离状态，其中非极化超流组分被部分极化的正常组分包围。利用局部密度近似下的平均场理论，研究了在交叉点的巴丁-库珀-施里弗一侧的质量不平衡双组分费米混合物，假设由费什巴赫共振诱导的s波配对，并施加相分离状态的相平衡条件。选择不平衡化学势小于能隙，以避免在此处考虑的 regime 中出现其他可能的相。自洽地获得能隙和哈特里-福克势。然后研究了相互作用强度和质量比对标度律、超流态密度和准粒子比热的影响。在研究的参数范围内，增加相互作用强度的大小会增加平均和不平衡化学势，同时减小能隙和超流态密度。总准粒子比热随着不平衡化学势和相互作用强度的增加而减小，但随着质量比的增加而增加。镝和钾原子的费米-费米混合物的结果表明，比热提供了质量不对称配对的热特征。
英文摘要：
Mass imbalance changes not only pairing in a polarized Fermi gas but also the thermodynamic condition under which normal and superfluid components can remain phase separated. The low-temperature properties of mass imbalanced two component Fermi gases are investigated within the local density approximation on the BCS side of the BCS BEC crossover, with an unpolarized superfluid spatially separated from a partially polarized normal component. For each interaction strength and mass ratio, the pairing gap, average chemical potential, Hartree Fock potentials, and imbalance chemical potential are obtained self consistently, with the latter determined by the normal superfluid phase separation condition rather than varied independently. The results show that a larger mass ratio requires a larger imbalance chemical potential to maintain phase separation. For the 163Dy 40K mixture, an increase in the absolute value of the interaction strength raises the average and imbalance chemical potentials while reducing the pairing gap. The resulting changes modify the quasiparticle spectrum and the superfluid density of states and are reflected directly in the thermal response, with the quasiparticle specific heat decreasing at a fixed mass ratio. In contrast, increasing the mass ratio enhances the specific heat, which is associated with the larger density of available states near the Fermi surface of the heavier majority component. The results thus connect the normal superfluid phase separation condition with the quasiparticle spectrum and superfluid density of states, and show that the specific heat provides a clear thermal signature of mass imbalance in the phase separated regime.
