Spin-Imbalanced Quasi-Two-Dimensional Fermi Gases

被引：67

作者：

Ong, W. ^{[1
,2
]}

Cheng, Chingyun ^{[1
,2
]}

Arakelyan, I. ^{[1
]}

Thomas, J. E. ^{[1
]}

机构：

[1] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[2] Duke Univ, Dept Phys, Durham, NC 27708 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 11期

基金：

美国国家科学基金会;

关键词：

BOUND-STATES; 2; DIMENSIONS; PHASE; CONDENSATION;

D O I：

10.1103/PhysRevLett.114.110403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the density profiles for a Fermi gas of Li-6 containing N-1 spin-up atoms and N-2 spin-down atoms, confined in a quasi-two-dimensional geometry. The spatial profiles are measured as a function of spin imbalance N-2/N-1 and interaction strength, which is controlled by means of a collisional (Feshbach) resonance. The measured cloud radii and central densities are in disagreement with mean-field Bardeen-Cooper-Schrieffer theory for a true two-dimensional system. We find that the data for normal-fluid mixtures are reasonably well fit by a simple two-dimensional polaron model of the free energy. Not predicted by the model is a phase transition to a spin-balanced central core, which is observed above a critical value of N-2/N-1. Our observations provide important benchmarks for predictions of the phase structure of quasi-two-dimensional Fermi gases.

引用

页数：5

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