Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates

Details Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates

2007-08-07

arxiv.org/abs/0708.0894v3

Phys. Rev. Lett. 100, 110403 (March 2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures; added references; accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.110403

The density-matrix renormalization group is employed to investigate a harmonically-trapped imbalanced Fermi condensate based on a one-dimensional attractive Hubbard model. The obtained density profile shows a flattened population difference of spin-up and spin-down components at the center of the trap, and exhibits phase separation between the condensate and unpaired majority atoms for a certain range of the interaction and population imabalance $P$. The two-particle density matrix reveals that the sign of the order parameter changes periodically, demonstrating the realization of the Fulde-Ferrell-Larkin-Ovchinnikov phase. The minority spin atoms contribute to the quasi-condensate up to at least $P \simeq 0.8$. Possible experimental situations to test our predictions are discussed.

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