Composite-boson approach to molecular Bose-Einstein condensates in mixtures of ultracold Fermi gases
arXiv:1609.05949 · doi:10.1103/PhysRevA.95.023617
Abstract
We show that an ansatz based on independent composite bosons [Phys. Rep. 463, 215 (2008)] accurately describes the condensate fraction of molecular Bose-Einstein condensates in ultracold Fermi gases. The entanglement between the fermionic constituents of a single Feshbach molecule then governs the many-particle statistics of the condensate, from the limit of strong interaction to close to unitarity. This result strengthens the role of entanglement as the indispensable driver of composite-boson behavior. The condensate fraction of fermion pairs at zero temperature that we compute matches excellently previous results obtained by means of fixed-node diffusion Monte Carlo methods and the Bogoliubov depletion approximation. This paves the way towards the exploration of the BEC-BCS crossover physics in mixtures of cold Fermi gases with an arbitrary number of fermion pairs as well as the implementation of Hong-Ou-Mandel-like interference experiments proposed within coboson theory.
9 pages, 5 figures
References in corpus (10)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Observation of Bose-Einstein Condensation of Molecules
- Collective excitations of a degenerate gas at the BEC-BCS crossover
- Molecular Probe of Pairing in the BEC-BCS Crossover
- Verification of universal relations in a strongly interacting Fermi gas
- Bosonic behavior of entangled fermions
- Collective interference of composite two-fermion bosons
- Statistical signatures of states orthogonal to the Fock-state ladder of composite bosons
- Simple model of Feshbach resonance in the strong-coupling regime
Cited by in corpus (5)
- Making statistics work: a quantum engine in the BEC-BCS crossover
- Fermionic versus bosonic behavior of confined Wigner molecules
- Statistical signatures of states orthogonal to the Fock-state ladder of composite bosons
- On the description of composite bosons in discrete models
- Composite Bosons Superposition Ansatz Approach to One-Dimensional Trapped Few-Fermion Systems