期刊
PHYSICAL REVIEW B
卷 94, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.205110
关键词
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资金
- ERC Advanced Grant [338957 FEMTO/NANO]
- NWO via Spinoza Prize
- DFG [FOR 1346, SPP 1459]
- computer time at the North-German Supercomputing Alliance (HLRN)
Extended dynamical mean-field theory (EDMFT) is insufficient to describe nonlocal effects in strongly correlated systems, since corrections to the mean-field solution are generally large. We present an efficient scheme for the construction of diagrammatic extensions of EDMFT that avoids the usual double-counting problem by using an exact change of variables (the Dual Boson formalism) to distinguish the correlations included in the dynamical mean-field solution and those beyond. With a computational efficiency comparable to the EDMFT + GW approach, our scheme significantly improves on the charge order transition phase boundary in the extended Hubbard model.
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