1. Thermodynamics of Spin-Imbalanced Fermi Gases with SU(N) Symmetric Interaction
- Author
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He, Chengdong, Gao, Xin-Yuan, Pak, Ka Kwan, Liu, Yu-Jun, Ren, Peng, Guo, Mengbo, Zhao, Entong, Yan, Yangqian, and Jo, Gyu-Boong
- Subjects
Condensed Matter - Quantum Gases ,Physics - Atomic Physics ,Quantum Physics - Abstract
Thermodynamics of degenerate Fermi gases has been extensively studied through various aspects such as Pauli blocking effects, collective modes, BCS superfluidity, and more. Despite this, multi-component fermions with imbalanced spin configurations remain largely unexplored, particularly beyond the two-component scenario. In this work, we generalize the thermodynamic study of SU($N$) fermions to spin-imbalanced configurations based on density fluctuations. Theoretically, we provide closed-form expressions of density fluctuation across all temperature ranges for general spin population setups. Experimentally, after calibrating the measurements with deeply degenerate $^{173}$Yb Fermi gases under spin-balanced configurations ($N\leq$~6), we examine the density fluctuations in spin-imbalanced systems. Specifically, we investigate two-species and four-species configurations to validate our theoretical predictions. Our analysis indicates that interaction enhancement effects can be significant even in highly spin-imbalanced systems. Finally, as an application, we use this approach to examine the decoherence process. Our study provides a deeper understanding of the thermodynamic features of spin-imbalanced multi-component Fermi gases and opens new avenues for exploring complex quantum many-body systems., Comment: 6 pages, 4 figures, supplementary
- Published
- 2024