Effective models are constructed for a newly discovered superconductor (Nd, Sr) Ni O 2,
which has been considered as a possible nickelate analog of the cuprates. Estimation of the …

We review nonperturbative numerical calculations on dynamical properties of the two-
dimensional Hubbard model and their relevance to various spectroscopic experiments on …

Strongly correlated solids are complex and fascinating quantum systems, where new
electronic states continue to emerge, especially when interaction with light triggers interplay …

The density functional theory (DFT)+ U method is a pragmatic and effective approach for
calculating the ground-state properties of strongly correlated systems, and linear-response …

Three types (three-band, two-band, and one-band) of effective Hamiltonians for HgBa 2 CuO
4 and three-band effective Hamiltonian for La 2 CuO 4 are derived by improving the …

For the recently discovered cuprate superconductor Ba 2 CuO 3+ δ, we propose a lattice
structure which resembles the model considered by Lieb to represent the vastly oxygen …

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 …

We carry out a detailed study of the role of electronic interaction on p oxygen orbitals in a
Mott insulator oxide (UO 2) and a charge transfer oxide (TiO 2). First, we calculate values of …

We have applied the model-mapped random phase approximation (RPA)[H. Sakakibara et
al., J. Phys. Soc. Jpn. 86, 044714 (2017) JUPSAU 0031-9015 10.7566/JPSJ. 86.044714] to …

In order to theoretically identify the factors governing superconductivity in multilayer
cuprates, a three-layer Hubbard model is studied with the two-particle self-consistent (TPSC) …