3 citations · 3 across the 1 of their papers we have counts for
8 papers
Deformation of SU(4) singlet spin-orbital state due to Hund's rule coupling
Hiroaki Onishi
We investigate the ground-state property and the excitation gap of a one-dimensional spin-orbital model with isotropic spin and anisotropic orbital exchange interactions, which rep…
Stripe Charge Ordering in Triangular-Lattice Systems
Hiroaki Onishi, Takashi Hotta
We investigate the ground-state properties of a t2g-orbital Hubbard model on a triangular lattice at electron density 5.5 by using numerical techniques. There appear several types…
Spin, charge, and orbital correlations in the one-dimensional t2g-orbital Hubbard model
Jose Xavier, Hiroaki Onishi, Takashi Hotta +1
We present the zero-temperature phase diagram of the one-dimensional t2g-orbital Hubbard model, obtained using the density-matrix renormalization group and Lanczos techniques. Emph…
Spin-charge-orbital ordering on triangle-based lattices
Hiroaki Onishi, Takashi Hotta
We investigate the ground-state property of an e_g-orbital Hubbard model at quarter filling on a zigzag chain by exploiting the density matrix renormalization group method. When tw…
Orbital-based Scenario for Magnetic Structure of Neptunium Compounds
Hiroaki Onishi, Takashi Hotta
In order to understand a crucial role of orbital degree of freedom in the magnetic structure of recently synthesized neptunium compounds NpTGa_5 (T=Fe, Co, and Ni), we propose to d…
Suppression of Spin Frustration due to Orbital Selection
Hiroaki Onishi, Takashi Hotta
In order to clarify a crucial role of orbital degree of freedom in geometrically frustrated systems, we investigate both ground- and excited-state properties of the e_g-orbital deg…