Single-particle spectral functions in the normal phase of a strongly-attractive Bose-Fermi mixture

Abstract

We calculate the single-particle spectral functions and quasi-particle dispersions for a Bose-Fermi mixture when the boson-fermion attraction is sufficiently strong to suppress completely the condensation of bosons at zero temperature. Within a T-matrix diagrammatic approach, we vary the boson-fermion attraction from the critical value where the boson condensate first disappears to the strongly attractive (molecular) regime and study the effect of both mass- and density-imbalance on the spectral weights and dispersions. An interesting spectrum of particle-hole excitations mixing two different Fermi surfaces is found. These unconventional excitations could be produced and explored experimentally with radio-frequency spectroscopy.

13 pages, 7 figures

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• Condensed phase of Bose-Fermi mixtures with a pairing interaction
• Mean-field phase diagram of the Bose-Fermi Hubbard model
• Bose-Fermi mixtures in the molecular limit
• Nonlinear optical response of resonantly driven polaron-polaritons
• Single-Particle properties of a strongly-interacting Bose-Fermi mixture with mass and population imbalance
• Single-particle Excitations and Effects of Hetero-pairing Fluctuations in a Bose-Fermi Mixture with a Feshbach Resonance
• Second root of dilute Bose-Fermi mixtures
• Spectral properties and observables in ultracold Fermi gases
• Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures
• Energy of strongly attractive Bose-Fermi mixtures
• Mechanical stability of resonant Bose-Fermi mixtures
• Normal-state Properties of a Unitary Bose-Fermi Mixture: A Combined Strong-coupling Approach with Universal Thermodynamics
• Quantum Monte Carlo study of the indirect Pauli exclusion effect in Bose-Fermi mixtures