Journal
PHYSICAL REVIEW B
Volume 84, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.155106
Keywords
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Funding
- DOE SciDAC [DE-FC02-06ER25792]
- NSF [OISE-0952300]
- NSF through National Institute for Computational Sciences [TG-DMR100007]
- Louisiana State University
- Office Of The Director
- Office Of Internatl Science &Engineering [952300] Funding Source: National Science Foundation
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We have designed a multiscale approach for strongly correlated systems by combining the dynamical cluster approximation (DCA) and the recently introduced dual fermion formalism. This approach employs an exact mapping from a real lattice to a DCA cluster of linear size L(c) embedded in a dual fermion lattice. Short-length-scale physics is addressed by the DCA cluster calculation, while longer-length-scale physics is addressed diagrammatically using dual fermions. The bare and dressed dual fermionic Green functions scale as O(1/L(c)), so perturbation theory on the dual lattice converges very quickly, e.g., the dual Fermion self-energy calculated with simple second-order perturbation theory is of order O(1/Lc(3)) with third-order and three-body corrections down by an additional factor of O(1/L(c)).
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