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Title: Contact interaction in an unitary ultracold Fermi gas

An ultracold Fermi atomic gas at unitarity presents universal properties that in the dilute limit can be well described by a contact interaction. By employing a guiding function with correct boundary conditions and making simple modifications to the sampling procedure we are able to calculate the properties of a true contact interaction with the diffusion Monte Carlo method. The results are obtained with small variances. Our calculations for the Bertsch and contact parameters are in excellent agreement with published experiments. The possibility of using a more faithful description of ultracold atomic gases can help uncover additional features of ultracold atomic gases. In addition, this work paves the way to perform quantum Monte Carlo calculations for other systems interacting with contact interactions, where the description using potentials with finite effective range might not be accurate.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. Federal do Goias, GO (Brazil); Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
  3. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Univ. of Colorado, Boulder, CO (United States). National Inst. of Standards and Technology, JILA
  4. Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
Publication Date:
OSTI Identifier:
1329861
Report Number(s):
LA-UR--15-23861
Journal ID: ISSN 1050-2947
Grant/Contract Number:
AC52-06NA25396; PHY-1404405; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 92; Journal Issue: 6; Journal ID: ISSN 1050-2947
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Laboratory (LANL)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS Atomic and Nuclear Physics