Investigation of the effective interactions for the Emery model by the constrained random-phase approximation and constrained functional renormalization group

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Abstract:

The effective interaction of downfolded low-energy models for electrons in solids can be obtained by integrating out the high energy bands away from the target band near the Fermi level. Here, we apply the constrained random-phase approximation (cRPA) and constrained functional renormalization group (cfRG), which can go beyond cRPA by i...More

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