Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates

2007/08/31 by Masaki Tezuka, Masahito Ueda · 6 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum many-body systems #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.100.110403

published as Phys. Rev. Lett. 100, 110403 (March 2008) · 4 pages, 3 figures; added references; accepted for publication in Phys. Rev. Lett

arxiv created 2008/02/07 · openalex publication_date 2008/03/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 imbalance 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 quasicondensate up to at least P approximately 0.8. Possible experimental situations to test our predictions are discussed.

Citations

• Molecular Probe of Pairing in the BEC-BCS Crossover
• Observation of resonance condensation of fermionic atom pairs
• Phase Diagram of a Strongly Interacting Polarized Fermi Gas in One Dimension
• Mean-field thermodynamics of a spin-polarized spherically trapped Fermi gas at unitarity

Cited by

• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
• Imbalanced Feshbach-resonant Fermi gases
• Phase separation of trapped spin-imbalanced Fermi gases in one-dimensional optical lattices
• Fulde-Ferrell-Larkin-Ovchinnikov state in the one-dimensional attractive Hubbard model and its fingerprint in spatial noise correlations
• Finite-temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap
• Ground states and dynamics of population-imbalanced Fermi condensates in one dimension