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Title: Dynamical mean field theory simulations with the adaptive sampling configuration interaction method

Abstract

In the pursuit of accurate descriptions of strongly correlated quantum many-body systems, dynamical mean field theory (DMFT) has been an invaluable tool for elucidating the spectral properties and quantum phases of both phenomenological models and ab initio descriptions of real materials. Key to the DMFT process is the self-consistent map of the original system into an Anderson impurity model, the ground state of which is computed using an impurity solver. The power of the method is thus limited by the complexity of the impurity model the solver can handle. Simulating realistic systems generally requires many correlated sites. By adapting the recently proposed adaptive sampling configuration interaction (ASCI) method as an impurity solver, we enable much more efficient zero-temperature DMFT simulations. The key feature of the ASCI method is that it selects only the most relevant Hilbert space degrees of freedom to describe the ground state. This reduces the numerical complexity of the calculation, which will allow us to pursue future DMFT simulations with more correlated impurity sites than in previous works. Here, we present the ASCI-DMFT method and example calculations on the one- and two-dimensional Hubbard models that exemplify its efficient convergence and timing properties. We show that the ASCImore » approach is several orders of magnitude faster than the current best published ground-state DMFT simulations, which allows us to study the bath discretization error in simulations with small clusters, as well as to address cluster sizes beyond the current state of the art. Finally, our approach can also be adapted for other embedding methods such as density matrix embedding theory and self-energy embedding theory.« less

Authors:
ORCiD logo [1];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1605254
Grant/Contract Number:  
AC02-05CH11231; OCI-1053575
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Mejuto-Zaera, Carlos, Tubman, Norm M., and Whaley, K. Birgitta. Dynamical mean field theory simulations with the adaptive sampling configuration interaction method. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.125165.
Mejuto-Zaera, Carlos, Tubman, Norm M., & Whaley, K. Birgitta. Dynamical mean field theory simulations with the adaptive sampling configuration interaction method. United States. https://doi.org/10.1103/PhysRevB.100.125165
Mejuto-Zaera, Carlos, Tubman, Norm M., and Whaley, K. Birgitta. Mon . "Dynamical mean field theory simulations with the adaptive sampling configuration interaction method". United States. https://doi.org/10.1103/PhysRevB.100.125165. https://www.osti.gov/servlets/purl/1605254.
@article{osti_1605254,
title = {Dynamical mean field theory simulations with the adaptive sampling configuration interaction method},
author = {Mejuto-Zaera, Carlos and Tubman, Norm M. and Whaley, K. Birgitta},
abstractNote = {In the pursuit of accurate descriptions of strongly correlated quantum many-body systems, dynamical mean field theory (DMFT) has been an invaluable tool for elucidating the spectral properties and quantum phases of both phenomenological models and ab initio descriptions of real materials. Key to the DMFT process is the self-consistent map of the original system into an Anderson impurity model, the ground state of which is computed using an impurity solver. The power of the method is thus limited by the complexity of the impurity model the solver can handle. Simulating realistic systems generally requires many correlated sites. By adapting the recently proposed adaptive sampling configuration interaction (ASCI) method as an impurity solver, we enable much more efficient zero-temperature DMFT simulations. The key feature of the ASCI method is that it selects only the most relevant Hilbert space degrees of freedom to describe the ground state. This reduces the numerical complexity of the calculation, which will allow us to pursue future DMFT simulations with more correlated impurity sites than in previous works. Here, we present the ASCI-DMFT method and example calculations on the one- and two-dimensional Hubbard models that exemplify its efficient convergence and timing properties. We show that the ASCI approach is several orders of magnitude faster than the current best published ground-state DMFT simulations, which allows us to study the bath discretization error in simulations with small clusters, as well as to address cluster sizes beyond the current state of the art. Finally, our approach can also be adapted for other embedding methods such as density matrix embedding theory and self-energy embedding theory.},
doi = {10.1103/PhysRevB.100.125165},
journal = {Physical Review B},
number = 12,
volume = 100,
place = {United States},
year = {Mon Sep 30 00:00:00 EDT 2019},
month = {Mon Sep 30 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Efficient hybridization fitting for dynamical mean-field theory via semi-definite relaxation
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Efficient hybridization fitting for dynamical mean-field theory via semi-definite relaxation
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