95 citations · 150 across the 3 of their papers we have counts for
9 papers
Real-space renormalization group approach for the corner Hamiltonian
Kouichi Okunishi
We present a real-space renormalization group approach for the corner Hamiltonian, which is relevant to the reduced density matrix in the density matrix renormalization group. A se…
Fractional S^z excitation and its bound state around the 1/3 plateau of the S=1/2 Ising-like zigzag XXZ chain
Kouichi Okunishi, Takashi Tonegawa
We present the microscopic view for the excitations around the 1/3 plateau state of the Ising-like zigzag XXZ chain. We analyze the low-energy excitations around the plateau with t…
Magnetic phase diagram of the S=1/2 antiferromagnetic zigzag spin chain in the strongly frustrated region: cusp and plateau
Kouichi Okunishi, Takashi Tonegawa
We determine the magnetic phase diagram of the antiferromagnetic(AF) zigzag spin chain in the strongly frustrated region, using the density matrix renormalization group method. We…
Universal relation between the dispersion curve and the ground-state correlation length in 1D antiferromagnetic quantum spin systems
K. Okunishi, Y. Akutsu, N. Akutsu +1
We discuss an universal relation with in 1D quantum spin systems with an excitation gap, where is the dispersion curve of the low-energy excitatio…
Spinon excitation and Möbius boundary condition in S=1/2 antiferromagnetic Heisenberg spin ladder with zigzag structure
Kouichi Okunishi, Nobuya Maeshima
We investigate the low-lying excitation of the antiferromagnetic zigzag spin ladder with Möbius boundary condition. Using the Lanczos and Householder diagonalization methods, we ca…
Universal Asymptotic Eigenvalue Distribution of Density Matrices and the Corner Transfer Matrices in the Thermodynamic Limit
Kouichi Okunishi, Yasuhiro Hieida, Yasuhiro Akutsu
We study the asymptotic behavior of the eigenvalue distribution of the Baxter's corner transfer matrix (CTM) and the density matrix (DM) in the White's density-matrix renormalizati…