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• W2940452322 abstract "Computing momentum-dependent susceptibilities in the dynamical mean-field theory (DMFT) requires solving the Bethe-Salpeter equation, which demands large computational cost. Exploiting the strong-coupling feature of local fluctuations, we derive a simplified formula that can be solved at a considerably lower cost. The validity and the physical meaning of the formula are confirmed by deriving the effective intersite interactions in the strong-coupling limit, such as the kinetic exchange and RKKY interactions. Furthermore, numerical calculations for single-orbital and multiorbital models demonstrate surprisingly wider applicability including a weak-coupling region. Based on this formula, we propose three levels of practical approximations that can be chosen depending on complexity of problems. Simpler evaluations of spin and orbital susceptibilities in multiorbital systems thus become possible within DMFT." @default.
• W2940452322 created "2019-05-03" @default.
• W2940452322 creator A5054151968 @default.
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• W2940452322 creator A5069591832 @default.
• W2940452322 date "2019-04-23" @default.
• W2940452322 modified "2023-10-16" @default.
• W2940452322 title "Strong-coupling formula for momentum-dependent susceptibilities in dynamical mean-field theory" @default.
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• W2940452322 doi "https://doi.org/10.1103/physrevb.99.165134" @default.
• W2940452322 hasPublicationYear "2019" @default.
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