Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-02-07
Phys. Rev. B 83, 195429 (2011)
Physics
Condensed Matter
Quantum Gases
Scientific paper
10.1103/PhysRevB.83.195429
Motivated by potential realizations in cold-atom or cold-molecule systems, we have performed quantum Monte Carlo simulations of two-component gases of fermions in two dimensions with hard-core interactions. We have determined the gross features of the zero-temperature phase diagram, by investigating the relative stabilities of paramagnetic and ferromagnetic fluids and crystals. We have also examined the effect of including a pairwise, long-range r^(-3) potential between the particles. Our most important conclusion is that there is no region of stability for a ferromagnetic fluid phase, even if the long-range interaction is present. We also present results for the pair-correlation function, static structure factor, and momentum density of two-dimensional hard-core fluids.
Cooper Nigel R.
Drummond Neil D.
Needs Richard J.
Shlyapnikov Georgy V.
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