Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Correlated Electrons: Method Development 1
TT 33.3: Talk
Wednesday, March 18, 2020, 10:00–10:15, HSZ 201
Strong-coupling formula for momentum-dependent susceptibilities in dynamical mean-field theory — •Junya Otsuki1, Kazuyoshi Yoshimi2, Hiroshi Shinaoka3, and Yusuke Nomura4 — 1Research Institute for Interdisciplinary Science, Okayama University, Okayama Japan — 2Institute for Solid State Physics, University of Tokyo, Chiba, Japan — 3Saitama University, Saitama, Japan — 4University of Tokyo, Tokyo, Japan
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 [1]. This formula allows us to estimate an effective intersite interaction, which is reduced to a well-known formula in the strong-coupling limit, such as the kinetic exchange and RKKY interactions. We present some applications of this formula to demonstrate its validity and applicability.
[1] J. Otsuki, K. Yoshimi, H. Shinaoka, Y. Nomura, Phys. Rev. B 99, 165134 (2019)