Ground states and dynamics of population-imbalanced Fermi condensates in one dimension

Details Ground states and dynamics of population-imbalanced Fermi condensates in one dimension Ground states and dynamics of population-imbalanced Fermi condensates in one dimension

2010-02-07

arxiv.org/abs/1002.1433v3

New J. Phys. 12 (2010) 055029

Physics

Condensed Matter

Quantum Gases

20 pages, 15 figures, accepted for publication in New Journal of Physics

Scientific paper

10.1088/1367-2630/12/5/055029

By using the numerically exact density-matrix renormalization group (DMRG) approach, we investigate the ground states of harmonically trapped one-dimensional (1D) fermions with population imbalance and find that the Larkin-Ovchinnikov (LO) state, which is a condensed state of fermion pairs with nonzero center-of-mass momentum, is realized for a wide range of parameters. The phase diagram comprising the two phases of i) an LO state at the trap center and a balanced condensate at the periphery and ii) an LO state at the trap center and a pure majority component at the periphery, is obtained. The reduced two-body density matrix indicates that most of the minority atoms contribute to the LO-type quasi-condensate. With the time-dependent DMRG, we also investigate the real-time dynamics of a system of 1D fermions in response to a spin-flip excitation.

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