Probing the dynamic structure factor of a neutral Fermi superfluid along the BCS-BEC crossover using atomic impurity qubits
arXiv:1609.08131 · doi:10.1103/PhysRevA.94.063618
Abstract
We study an impurity atom trapped by an anharmonic potential, immersed within a cold atomic Fermi gas with attractive interactions that realizes the crossover from a Bardeen-Cooper-Schrieffer (BCS) superfluid to a Bose-Einstein condensate (BEC). Considering the qubit comprising the lowest two vibrational energy eigenstates of the impurity, we demonstrate that its dynamics probes the equilibrium density fluctuations encoded in the dynamic structure factor of the superfluid. Observing the impurity's evolution is thus shown to facilitate nondestructive measurements of the superfluid order parameter and the contact between collective and single-particle excitation spectra. Our setup constitutes a novel model of an open quantum system interacting with a thermal reservoir, the latter supporting both bosonic and fermionic excitations that are also coupled to each other.
Updated to final author version. 9+7 pages, 18 figures
References in corpus (29)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Weakly bound dimers of fermionic atoms
- Generalized Virial Theorem and Pressure Relation for a strongly correlated Fermi gas
- A trapped single ion inside a Bose-Einstein condensate
- Bose-Fermi Mixtures in a Three-dimensional Optical Lattice
- Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
- Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas
- Time dependent impurity in ultracold fermions: orthogonality catastrophe and beyond
- Bragg spectroscopy of a strongly interacting Fermi gas
- BCS-BEC crossover induced by a synthetic non-Abelian gauge field
- Precise determination of the structure factor and contact in a unitary Fermi gas
- Collective oscillations of a Fermi gas in the unitarity limit: Temperature effects and the role of pair correlations
- Dark state cooling of atoms by superfluid immersion
- Detection of acceleration radiation in a Bose-Einstein condensate
- Coherent Interaction of a Single Fermion with a Small Bosonic Field
- Collective decoherence of cold atoms coupled to a Bose-Einstein condensate
- Polarons in Ultracold Fermi Superfluids
- Polaronic atom-trimer continuity in three-component Fermi gases
- Non-destructive selective probing of phononic excitations in a cold Bose gas using impurities
- Rydberg Electrons in a Bose-Einstein Condensate
- Dissipative dynamics of atomic Hubbard models coupled to a phonon bath: Dark state cooling of atoms within a Bloch band of an optical lattice
- Quantitative comparison between theoretical predictions and experimental results for Bragg spectroscopy of a strongly interacting Fermi superfluid
- Bragg scattering of Cooper pairs in an ultra-cold Fermi gas
- Toward quantum simulations of biological information flow
- Finite temperature damping of collective modes of a BCS-BEC crossover superfluid
- Many-body theories of density response for a strongly correlated Fermi gas