Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.206401
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Funding
- DFG [SFB 668-A3, 436 RUS 113/938/0]
- NWO [047.016.005]
- RFFI [08-03-00930, 08-0291953, 08-02-01020]
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We present a novel approach to long-range correlations beyond dynamical mean-field theory, through a ladder approximation to dual fermions. The new technique is applied to the two-dimensional Hubbard model. We demonstrate that the transformed perturbation series for the nonlocal dual fermions has superior convergence properties over standard diagrammatic techniques. The critical Neel temperature of the mean-field solution is suppressed in the ladder approximation, in accordance with quantum Monte Carlo results. An illustration of how the approach captures and allows us to distinguish short- and long-range correlations is given.
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