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 (22)

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• Fermi surfaces and Luttinger's theorem in paired fermion systems
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Cited by in corpus (36)

• Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
• Ultrafast many-body interferometry of impurities coupled to a Fermi sea
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Ultra-cold Polarized Fermi Gases
• Bipolarons in a Bose-Einstein Condensate
• Boiling a Unitary Fermi Liquid
• Fermi-Liquid Behavior of the Normal Phase of a Strongly Interacting Gas of Cold Atoms
• Landau Effective Interaction between Quasiparticles in a Bose-Einstein Condensate
• Polarons and Molecules in a Two-Dimensional Fermi Gas
• Observation of a smooth polaron-molecule transition in a degenerate Fermi gas
• Mediated interactions between Fermi polarons and the role of impurity quantum statistics
• Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture
• Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture
• Repulsive Fermi Polarons and Their Induced Interactions in Binary Mixtures of Ultracold Atoms
• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• Induced interactions in dilute atomic gases and liquid helium mixtures
• Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture
• Scattering of two heavy Fermi polarons: resonances and quasibound states
• Interactions mediated by atoms, photons, electrons, and excitons
• Polarons and bipolarons in a two-dimensional square lattice
• Comment on "Normal phase of an imbalanced Fermi gas"
• Long range mediated interactions in a mixed dimensional system
• Finite-range effects in the unitary Fermi polaron
• Radiofrequency spectroscopy of one-dimensional trapped Bose polarons: crossover from the adiabatic to the diabatic regime
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Interaction beween polarons and analogous effects in polarized Fermi gases
• Application of lasers to ultracold atoms and molecules
• Superdiffusive nonequilibrium motion of an impurity in a Fermi sea
• Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
• Spin oscillations of the normal polarized Fermi gas at Unitarity
• Medium-enhanced polaron repulsion in a dilute Bose mixture
• Repulsive Fermi and Bose Polarons in Quantum Gases
• Superfluid-Normal Quantum Phase Transitions in an Imbalanced Fermi Gas
• The Gor'kov and Melik-Barkhudarov correction to an imbalanced Fermi gas in the presence of impurities
• The normal state of attractive Fermi gases from coupled-cluster theory
• Impurity in a zero-temperature three-dimensional Fermi gas