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Properties of the superfluid in the disordered Bose-Hubbard model

de Abreu, Bruno R. and Ray, Ushnish and Vitiello, Silvio A. and Ceperley, David M. (2018) Properties of the superfluid in the disordered Bose-Hubbard model. Physical Review A, 98 (2). Art. No. 023628. ISSN 2469-9926. https://resolver.caltech.edu/CaltechAUTHORS:20180827-094621592

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Abstract

We investigate the properties of the superfluid phase in the three-dimensional disordered Bose-Hubbard model using quantum Monte Carlo simulations. The phase diagram is generated using Gaussian disorder on the on-site potential. Comparisons with box and speckle disorder show qualitative similarities leading to the reentrant behavior of the superfluid. Quantitative differences that arise are controlled by the specific shape of the disorder. Statistics pertaining to disorder distributions are studied for a range of interaction strengths and system sizes, where strong finite-size effects are observed. Despite this, both the superfluid fraction and compressibility remain self-averaging throughout the superfluid phase. Close to the superfluid–Bose-glass phase boundary, finite-size effects dominate but still suggest that self-averaging holds. Our results are pertinent to experiments with ultracold atomic gases where a systematic disorder averaging procedure is typically not possible.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physreva.98.023628DOIArticle
https://arxiv.org/abs/1804.05789arXivDiscussion Paper
ORCID:
AuthorORCID
Ray, Ushnish0000-0002-1850-4691
Additional Information:© 2018 American Physical Society. (Received 26 April 2018; published 27 August 2018) This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) under Grants No. 141242/2014-0 and No. 232682/2014-3 (Science Without Borders program) and by the Fundação de Amparo á Pesquisa do Estado de São Paulo (FAPESP). Part of the computations were performed at the Centro Nacional de Processamento de Alto Desempenho em São Paulo (CENAPAD-SP), a high-performance computing facility at Unicamp. All simulations were done using CSSER, a parallel SSE based library available at https://github.com/ushnishray/CSSER.
Funders:
Funding AgencyGrant Number
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)141242/2014-0
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)232682/2014-3
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNSPECIFIED
Centro Nacional de Processamento de Alto Desempenho em São Paulo (CENAPAD-SP)UNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20180827-094621592
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180827-094621592
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89159
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:27 Aug 2018 20:27
Last Modified:03 Oct 2019 20:13

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