The GW+DMFT method provides a consistent scheme for the description of correlation and screening effects in lattice systems and a powerful tool for the study of nonequilibrium states [1,2]. We will discuss the formalism and its implementation for simple lattice models (single-orbital Hubbard and three-orbital "d-p” model) and investigate the effect of dynamical screening on the local interaction and spectral function. For the d-p model of charge transfer insulators, we demonstrate that the GW contribution to the self-energy is not relevant in equilibrium, but crucially important for the description of photo-excited states [3]. These model-level studies are a first step in the development of parameter-free ab-initio simulation approaches for correlated materials. [1] S. Biermann, F. Aryasetiawan, and A. Georges, Phys. Rev. Lett. 90, 086402 (2003). [2] D. Golez, L. Boehnke, M. Eckstein, and P. Werner, Phys. Rev. Lett. 118, 246402 (2017). [3] D. Golez, L. Boehnke, M. Eckstein, and P. Werner, arxiv:1808.02264 (2018).

連絡教員　物理学系　古賀　昌久（内線2727）