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.
arXiv comment9 pages, 5 figures
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Cited by in corpus (8)
- Making statistics work: a quantum engine in the BEC-BCS crossover
- Entanglement between two spatially separated ultracold interacting Fermi gases
- 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
- Strongly bound fermion pairs on a ring: a composite-boson approach
- Assembly of 2N entangled fermions into multipartite composite bosons
- Composite Bosons Superposition Ansatz Approach to One-Dimensional Trapped Few-Fermion Systems