148 citations · 179 across the 3 of their papers we have counts for
6 papers
Novel Electronic States in Graphene Ribbons -Competing Spin and Charge Orders-
Atsushi Yamashiro, Yukihiro Shimoi, Kikuo Harigaya +1
In a nanographene ring with zigzag edges, the spin-polarized state and the charge-polarized state are stabilized by the on-site and the nearest neighbor Coulomb repulsions, U and V…
Competition between spin and charge polarized states in nanographene ribbons with zigzag edges
Atsushi Yamashiro, Yukihiro Shimoi, Kikuo Harigaya +1
Effects of the nearest neighbor Coulomb interaction on nanographene ribbons with zigzag edges are investigated using the extended Hubbard model within the unrestricted Hartree-Fock…
Theoretical study on novel electronic properties in nanographite materials
Kikuo Harigaya, Atsushi Yamashiro, Yukihiro Shimoi +8
Antiferromagnetism in stacked nanographite is investigated with using the Hubbard-type model. We find that the open shell electronic structure can be an origin of the decreasing ma…
Spin-reflection positivity of the Kondo lattice at half-filling
T. Yanagisawa, Y. Shimoi
We examine the spin-reflection positivity of the ground state of the Kondo lattice model at half-filling with the antiferromagnetic and ferromagnetic exchange couplings . Fo…
Excitons in soliton and bipolaron lattice states of doped Peierls systems
Kikuo Harigaya, Yukihiro Shimoi, Shuji Abe
Exciton effects on soliton and bipolaron lattice states are investigated using an electron-lattice Peierls model with long-range Coulomb interactions. The Hartree-Fock (HF) approxi…
Exciton effects in soliton and bipolaron lattice states of doped electron-phonon Peierls systems
Kikuo Harigaya, Yukihiro Shimoi, Shuji Abe
Exciton effects on soliton and bipolaron lattice states are investigated using an electron-lattice Peierls model with long-range Coulomb interactions. The Hartree-Fock (HF) approxi…