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Open Quantum Systems Decoherence Quantum Thermodynamics

Repulsive Fermi polarons in a resonant mixture of ultracold {}6Li atoms

arXiv
Authors: F. Scazza, G. Valtolina, P. Massignan, A. Recati, A. Amico, A. Burchianti, C. Fort, M. Inguscio, M. Zaccanti, G. Roati

Year

2016

Paper ID

43210

Status

Preprint

Abstract Read

~2 min

Abstract Words

100

Citations

1

Abstract

We employ radio-frequency spectroscopy to investigate a polarized spin-mixture of ultracold {}6Li 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 Γ. 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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  • This paper contributes to the Quantum Thermodynamics research area in the Quantum Articles archive.
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  • We employ radio-frequency spectroscopy to investigate a polarized spin-mixture of ultracold ^6Li atoms close to a broad Feshbach scattering resonance.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1609.09817 [2] arXiv https://arxiv.org/abs/1609.09817 [3] Publisher https://arxiv.org/abs/1609.09817

Local Citation Graph (Related-Paper Links)

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External citation index: OpenAlex citation signal • updated 2026-06-12 14:07:45

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