The normal phase of an imbalanced Fermi gas

Abstract

Recent experiments on imbalanced Fermi gases have raised interest in the physics of an impurity immersed in a Fermi sea, the so-called Fermi polaron. In this letter, a simple theory is devised to describe dilute Fermi-polaron ensembles corresponding to the normal phase of an imbalanced Fermi gas. An exact formula is obtained for the dominant interaction between polarons, expressed solely in terms of a single polaron parameter. The physics of this interaction is identified as a signature of the Pauli exclusion principle.

4 pages, 2 figures, published in PRL

References in corpus (10)

• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Normal state of a polarized Fermi gas at unitarity
• Phase diagram of a strongly interacting polarized Fermi gas in one dimension
• Normal state of highly polarized Fermi gases: Full many-body treatment
• Ground state of a tightly bound composite dimer immersed in a Fermi Sea
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
• Fermi surfaces and Luttinger's theorem in paired fermion systems
• Density profiles of polarized Fermi gases confined in harmonic traps

Cited by in corpus (5)

• Ultra-cold Polarized Fermi Gases
• Polarons and Molecules in a Two-Dimensional Fermi Gas
• Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture
• Induced interactions in dilute atomic gases and liquid helium mixtures
• Comment on "Normal phase of an imbalanced Fermi gas"