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Title: Cluster size convergence of the density matrix embedding theory and its dynamical cluster formulation: A study with an auxiliary-field quantum Monte Carlo solver

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [3];  [2]
  1. Princeton Univ., NJ (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. College of William and Mary, Williamsburg, VA (United States)

In this work, we investigate the cluster size convergence of the energy and observables using two forms of density matrix embedding theory (DMET): the original cluster form (CDMET) and a new formulation motivated by the dynamical cluster approximation (DCA-DMET). Both methods are applied to the half-filled one- and two-dimensional Hubbard models using a sign-problem free auxiliary-field quantum Monte Carlo impurity solver, which allows for the treatment of large impurity clusters of up to 100 sites. While CDMET is more accurate at smaller impurity cluster sizes, DCA-DMET exhibits faster asymptotic convergence towards the thermodynamic limit. We use our two formulations to produce new accurate estimates for the energy and local moment of the two-dimensional Hubbard model for U/t=2,4,6. These results compare favorably with the best data available in the literature, and help resolve earlier uncertainties in the moment for U/t=2.

Research Organization:
Princeton Univ., NJ (United States); College of William and Mary, Williamsburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0008624; SC0008627; SC0010530
OSTI ID:
1535837
Alternate ID(s):
OSTI ID: 1338105
Journal Information:
Physical Review. B, Vol. 95, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (16)

Ab initio computations of molecular systems by the auxiliary-field quantum Monte Carlo method journal May 2018
A real-time extension of density matrix embedding theory for non-equilibrium electron dynamics journal February 2018
Incremental embedding: A density matrix embedding scheme for molecules journal November 2018
An optimized twist angle to find the twist-averaged correlation energy applied to the uniform electron gas journal May 2019
Energy-weighted density matrix embedding of open correlated chemical fragments journal July 2019
Projected density matrix embedding theory with applications to the two-dimensional Hubbard model journal August 2019
Dynamical mean-field theory, density-matrix embedding theory, and rotationally invariant slave bosons: A unified perspective journal December 2017
Rigorous wave function embedding with dynamical fluctuations journal December 2018
Stripe order in the underdoped region of the two-dimensional Hubbard model journal November 2017
Stripe order in the underdoped region of the two-dimensional Hubbard model text January 2017
Towards the solution of the many-electron problem in real materials: equation of state of the hydrogen chain with state-of-the-art many-body methods text January 2017
Dynamical Mean Field Theory, Density-Matrix Embedding Theory and Rotationally Invariant Slave Bosons: a Unified Perspective text January 2017
Rigorous wave function embedding with dynamical fluctuations text January 2018
An optimized twist angle to find the twist-averaged correlation energy applied to the uniform electron gas text January 2019
Efficient Implementation of Ab Initio Quantum Embedding in Periodic Systems: Density Matrix Embedding Theory text January 2019
Periodic Electronic Structure Calculations With Density Matrix Embedding Theory preprint January 2019