Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-03
Phys. Rev. A 77, 053614 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
References are added to the published version
Scientific paper
10.1103/PhysRevA.77.053614
We investigate effects of optical lattice potential in one- and two-dimensional two-component trapped Fermi gases with population imbalances. Using the exact diagonalization and the density matrix renormalization group methods complementarily, we calculate the atom density profile from the ground state many-body wavefunction as a function of attractive interaction strength for various population imbalances. The numerical results reveal that although a phase separation between the superfluid core and the shell cloud of excess atoms occurs as observed in experiments without the optical lattice, the population imbalance generally remains in the core region in contrast to the non-lattice cases. The essence of the numerical results in a strong attractive regime can be explained by an effective model composed of Cooper pairs and excess major fermions.
Machida Mami
Matsumoto Haru
Ohashi Yoji
Okumura Masahiko
Yamada Shoichi
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