Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 180, Issue 1-2, Pages 168-179Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-015-1283-0
Keywords
Fermi gases; Zero-range interaction; Unitary limit
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Funding
- Brazilian agency CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior) [11540/13-3]
- FAPESP [2010/10072-0]
- National Science Foundation [PHY-1404405]
- [CAPES-PVE-087/2012]
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An ultracold Fermi gas with a zero-range attractive potential in the unitary limit is investigated using variational and diffusion Monte Carlo methods. Previous calculations have used a finite-range interaction and extrapolate the results to zero-range. Here we extend the quantum Monte Carlo method to directly use a zero-range interaction without the need of an extrapolation. We employ a trial wave function with the correct boundary conditions and modify the sampling procedures to handle the zero-range interaction. The results are reliable and have low variance.
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