Pairing in a system of a few attractive fermions in a harmonic trap

@article{Sowinski2014PairingIA,
  title={Pairing in a system of a few attractive fermions in a harmonic trap},
  author={Tomasz Sowi'nski and Mariusz Gajda and Kazimierz Rzążewski},
  journal={Europhysics Letters},
  year={2014},
  volume={109}
}
We study a strongly attractive system of a few spin-(1/2) fermions confined in a one-dimensional harmonic trap, interacting via two-body contact potential. Performing exact diagonalization of the Hamiltonian we analyze the ground state and the thermal state of the system in terms of one- and two-particle reduced density matrices. We show how for strong attraction the correlated pairs emerge in the system. We find that the fraction of correlated pairs depends on temperature and we show that this… 

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