Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.083602
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Funding
- ERC [307032 QuFerm2D, 637738 PoLiChroM]
- EU [705269 SCOUTFermi2D]
- Ramon y Cajal fellowship, from MINECO [FOQUS FIS2013-46768, Severo Ochoa SEV-2015-0522]
- Generalitat de Catalunya [SGR 874]
- Fundacio Privada Cellex
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We employ radio-frequency spectroscopy to investigate a polarized spin mixture of ultracold Li-6 atoms close to a broad Feshbach scattering resonance. Focusing on the regime of strong repulsive interactions, we observe well-defined coherent quasiparticles even for unitarity-limited interactions. We characterize the many-body system by extracting the key properties of repulsive Fermi polarons: the energy E+, the effective mass m*, the residue Z, and the decay rate Gamma. Above a critical interaction, E+ is found to exceed the Fermi energy of the bath, while m* diverges and even turns negative, thereby indicating that the repulsive Fermi liquid state becomes energetically and thermodynamically unstable.
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