Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-10-05
Phys. Rev. A 81, 033619 (2010)
Physics
Condensed Matter
Quantum Gases
Scientific paper
10.1103/PhysRevA.81.033619
Variational and diffusion quantum Monte Carlo (VMC and DMC) calculations of the properties of the zero-temperature fermionic gas at unitarity are reported. The ratio of the energy of the interacting to the non-interacting gas for a system of 128 particles is calculated to be 0.4517(3) in VMC and 0.4339(1) in the more accurate DMC method. The spherically-averaged pair-correlation functions, momentum densities, and one-body density matrices are very similar in VMC and DMC, but the two-body density matrices and condensate fractions show some differences. Our best estimate of the condensate fraction of 0.51 is a little smaller than values from other quantum Monte Carlo calculations.
Morris Andrew J.
Needs Richard J.
Rios Pablo Lopez
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