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Atomic Fermi gas at the unitary limit by quantum Monte Carlo methods : Effects of the interaction range
| Content Provider | Semantic Scholar |
|---|---|
| Author | Li, Xin Kolorenč, Jindr̆ich Mitas, Lubos |
| Copyright Year | 2011 |
| Abstract | We calculate the ground-state properties of unpolarized two-component Fermi gas by the diffusion quantum Monte Carlo (DMC) methods. Using an extrapolation to the zero effective range of the attractive two-particle interaction, we find E/Efree to be 0.212(2), 0.407(2), 0.409(3) and 0.398(3) for 4, 14, 38 and 66 atoms, respectively. The obtained energies are lower than those from the previously reported fixed-node DMC studies. In order to test the quality of nodal surfaces and to estimate the impact of the fixed-node approximation we perform released-node DMC calculations for 4 and 14 atoms. Analysis of the released-node and the fixed-node results suggests that the main sources of the fixed-node errors are long-range correlations which are difficult to sample in the released-node approaches due to the fast growth of the bosonic noise. Besides energies, we evaluate the two-body density matrix and the condensate fraction. We find that the condensate fraction for the 66 atom system converges to 0.56(1) after the extrapolation to the zero interaction range. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://altair.physics.ncsu.edu/lubos/papers/becbcsXin.pdf.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Anatomic Node Approximation Arabic numeral 0 Atom Density matrix Diffusion Magnetic Resonance Imaging Diffusion Monte Carlo Energy, Physics Extrapolation Femtometer Monte Carlo method Node - plant part Quantum Monte Carlo |
| Content Type | Text |
| Resource Type | Article |
