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Title: Local Hamiltonians for quantitative Green's function embedding methods

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4901432· OSTI ID:1843750

Embedding calculations that find approximate solutions to the Schrödinger equation for large molecules and realistic solids are performed commonly in a three step procedure involving (i) construction of a model system with effective interactions approximating the low energy physics of the initial realistic system, (ii) mapping the model system onto an impurity Hamiltonian, and (iii) solving the impurity problem. We have developed a novel procedure for parametrizing the impurity Hamiltonian that avoids the mathematically uncontrolled step of constructing the low energy model system. Instead, the impurity Hamiltonian is immediately parametrized to recover the self-energy of the realistic system in the limit of high frequencies or short time. The effective interactions parametrizing the fictitious impurity Hamiltonian are local to the embedded regions, and include all the non-local interactions present in the original realistic Hamiltonian in an implicit way. We show that this impurity Hamiltonian can lead to excellent total energies and self-energies that approximate the quantities of the initial realistic system very well. Moreover, we show that as long as the effective impurity Hamiltonian parametrization is designed to recover the self-energy of the initial realistic system for high frequencies, we can expect a good total energy and self-energy. Lastly, we propose two practical ways of evaluating effective integrals for parametrizing impurity models.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0010381; ER16391
OSTI ID:
1843750
Alternate ID(s):
OSTI ID: 1224301
Journal Information:
Journal of Chemical Physics, Vol. 141, Issue 19; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (12)

Energy-weighted density matrix embedding of open correlated chemical fragments journal July 2019
Density-matrix based determination of low-energy model Hamiltonians from ab initio wavefunctions journal August 2015
Exploring connections between statistical mechanics and Green’s functions for realistic systems: Temperature dependent electronic entropy and internal energy from a self-consistent second-order Green’s function journal November 2016
Stochastic resolution of identity second-order Matsubara Green’s function theory journal July 2019
Charge ordering and correlation effects in the extended Hubbard model journal March 2017
Exploring connections between statistical mechanics and Green's functions for realistic systems. Temperature dependent electronic entropy and internal energy from a self-consistent second-order Green's function text January 2016
Fractional charge and spin errors in self-consistent Green’s function theory journal May 2015
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
Charge order and antiferromagnetism in the extended Hubbard model text January 2019
Finite temperature quantum embedding theories for correlated systems journal February 2017
Charge ordering and correlation effects in the extended Hubbard model text January 2016
Finite temperature quantum embedding theories for correlated systems text January 2016