Ab initio Derivation of Low-Energy Model for Alkali-Cluster-Loaded Sodalites (2009)
Nakamura, Kazuma, Koretsune, Takashi, Arita, Ryotaro
An effective low-energy model describing magnetic properties of alkali-cluster-loaded sodalites is derived by {\em ab initio} downfolding. We start with constructing an extended Hubbard model for...
Koretsune, Takashi, Motome, Yukitoshi, Furusaki, Akira
We study Mott transition in the two-dimensional Hubbard model on an anisotropic triangular lattice. We use the Lanczos exact diagonalization of finite-size clusters up to eighteen sites, and...
Koretsune, Takashi, Ogata, Masao
The equal-time pairing correlation function of the two-dimensional t-J model on a square lattice is studied using a high-temperature expansion method. The sum of the pairing correlation, its spatial...