Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/244235
Type: Artigo
Title: Contact interaction in a unitary ultracold Fermi gas
Author: Pessoa, Renato
Gandolfi, S.
Vitiello, S. A.
Schmidt, K. E.
Abstract: 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 reasonable 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.
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 reasonable 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.
Subject: Método de Monte Carlo
Férmions
Superfluidez
Country: Estados Unidos
Editor: American Physical Society
Citation: Contact Interaction In A Unitary Ultracold Fermi Gas. Amer Physical Soc, v. 92, p. DEC-2015.
Rights: aberto
Identifier DOI: 10.1103/PhysRevA.92.063625
Address: http://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.063625
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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