Volume 86, Number 4, May 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 June 2009|
Pair formation and collapse in imbalanced fermion populations with unequal masses
INLN, Université de Nice-Sophia Antipolis, CNRS; 1361 route des Lucioles, 06560 Valbonne, France
2 Centre for Quantum Technologies, National University of Singapore - 117542 Singapore
3 Lorentz-Instituut, Universiteit Leiden - Postbus 9504, 2300 RA, Leiden, The Netherlands
Corresponding author: email@example.com
Accepted: 1 May 2009
We present an exact quantum Monte Carlo study of the effect of unequal masses on pair formation in fermionic systems with population imbalance loaded into optical lattices. We have considered three forms of the attractive interaction and find in all cases that the system is unstable and collapses as the mass difference increases and that the ground state becomes an inhomogeneous collapsed state. We also address the question of canonical vs. grand canonical ensemble and its role, if any, in stabilizing certain phases.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 02.70.-c – Computational techniques; simulations / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2009
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