aqora

Quasiparticle residue and charge of the one-dimensional Fermi polaron

Giuliano Orso, L. Barisic, Ekaterina Gradova +2 more

Physical Review ADec 22, 20251 citation

Exchange-Correlation Effects and the Quasiparticle Properties in a Two-Dimensional Dipolar Fermi Liquid

Iran Seydi, Saeed H. Abedinpour, Reza Asgari +1 more

Journal of Superconductivity and Novel MagnetismDec 17, 20192 citations

Boiling a Unitary Fermi Liquid

Zhenjie Yan, Parth Patel, Biswaroop Mukherjee +3 more

We study the thermal evolution of a highly spin-imbalanced, homogeneous Fermi gas with unitarity limited interactions, from a Fermi liquid of polarons at low temperatures to a classical Boltzmann gas at high temperatures. Radio-frequency spectroscopy gives access to the energy, lifetime, and short-range correlations of Fermi polarons at low temperatures T. In this regime, we observe a characteristic T^{2} dependence of the spectral width, corresponding to the quasiparticle decay rate expected for a Fermi liquid. At high T, the spectral width decreases again towards the scattering rate of the classical, unitary Boltzmann gas, ∝T^{-1/2}. In the transition region between the quantum degenerate and classical regime, the spectral width attains its maximum, on the scale of the Fermi energy, indicating the breakdown of a quasiparticle description. Density measurements in a harmonic trap directly reveal the majority dressing cloud surrounding the minority spins and yield the compressibility along with the effective mass of Fermi polarons.We study the thermal evolution of a highly spin-imbalanced, homogeneous Fermi gas with unitarity limited interactions, from a Fermi liquid of polarons at low temperatures to a classical Boltzmann gas at high temperatures. Radio-frequency spectroscopy gives access to the energy, lifetime, and short-range correlations of Fermi polarons at low temperatures T. In this regime, we observe a characteristic T^{2} dependence of the spectral width, corresponding to the quasiparticle decay rate expected for a Fermi liquid. At high T, the spectral width decreases again towards the scattering rate of the classical, unitary Boltzmann gas, ∝T^{-1/2}. In the transition region between the quantum degenerate and classical regime, the spectral width attains its maximum, on the scale of the Fermi energy, indicating the breakdown of a quasiparticle description. Density measurements in a harmonic trap directly reveal the majority dressing cloud surrounding the minority spins and yield the compressibility along with the effective mass of Fermi polarons.

arXiv:1811.00481Physical Review LettersMar 6, 2019135 citations

Polaronic effects in one-dimensional Fermi gas

Ya-Dong Song, Huawen Zhang

The European Physical Journal DMay 1, 20194 citations

Phase transformations of the polaronic Fermi-liquid

WORLD SCIENTIFIC eBooksJan 1, 19960 citations

Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms

Ariel Sommer, Cheng-Hsun Wu, Martin W. Zwierlein +1 more

We have observed Fermi polarons, dressed spin-down impurities in a spin-up Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in the impurities’ rf spectrum that emerges from a broad incoherent background. We determine the polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance. At a critical interaction, we observe the transition from polaronic to molecular binding. Here, the imbalanced Fermi liquid undergoes a phase transition into a Bose liquid, coexisting with a Fermi sea.We have observed Fermi polarons, dressed spin-down impurities in a spin-up Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in the impurities’ rf spectrum that emerges from a broad incoherent background. We determine the polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance. At a critical interaction, we observe the transition from polaronic to molecular binding. Here, the imbalanced Fermi liquid undergoes a phase transition into a Bose liquid, coexisting with a Fermi sea.

APS Division of Atomic, Molecular and Optical Physics Meeting AbstractsJun 1, 20090 citations

Quasiparticles and Polaronic Effects in Crystals, Fermi Gasses and Fermi Liquids

Related papers

Quasiparticles and Polaronic Effects in Crystals, Fermi Gasses and Fermi Liquids

Related papers