Derivation of Matrix Product Ansatz for the Heisenberg Chain from Algebraic Bethe Ansatz (2009)
Katsura, Hosho, Maruyama, Isao
We derive a matrix product representation of the Bethe ansatz state for the XXX and XXZ spin-1/2 Heisenberg chains using the algebraic Bethe ansatz. In this representation, the components of the...
Ferromagnetism in the Hubbard model with Topological/Non-Topological Flat Bands (2009)
Katsura, Hosho, Maruyama, Isao, Tanaka, Akinori, Tasaki, Hal
We introduce and study two classes of Hubbard models with magnetic flux or with spin-orbit coupling, which have a flat lowest band separated from other bands by a nonzero gap. We study the Chern...
Edge states of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange (2008)
Arikawa, Mitsuhiro, Tanaya, Shou, Maruyama, Isao, Hatsugai, Yasuhiro
A topological insulator and its spin analogue as a gapped spin liquid have characteristic low energy excitations (edge states) within the gap when the systems have boundaries. This is the bulk-edge...
Topological Aspects of Surface States in Semiconductors (2008)
Kuge, Yoshihiro, Maruyama, Isao, Hatsugai, Yasuhiro
Topological aspects of surface states in semiconductors are studied by an adiabatic deformation which connects a realistic system and a decoupled covalent-bond model. Two topological invariants are...
Nontrivial quantized Berry phases for itinerant spin liquids (2007)
Maruyama, Isao, Hatsugai, Yasuhiro
Quantized Berry phases as local order parameters in t-J models are studied. A texture pattern of the local order parameters is topologically stable due to the quantization of non-Abelian Berry phases...
Levitation and percolation in quantum Hall systems with correlated disorder (2007)
Song, Hui, Maruyama, Isao, Hatsugai, Yasuhiro
We investigate the integer quantum Hall system in a two dimensional lattice model with spatially correlated disorder by using the efficient method to calculate the Chern number proposed by Fukui...
Maruyama, Isao, Koide, Tetsuji, Hatsugai, Yasuhiro
A new type of external fields violating the particle number preservation is studied in one-dimensional strongly correlated systems by the Density Matrix Renormalization Group method. Due to the U(1)...
Theory of Fano-Kondo effect of transport properties through quantum dots (2004)
Maruyama, Isao, Shibata, Naokazu, Ueda, Kazuo
The Fano-Kondo effect in zero-bias conductance is investigated based on a theoretical model for the T-shaped quantum dot. The conductance as a function of the gate voltage is generally characterized...
Conductance through Quantum Dots Studied by Finite Temperature DMRG (2004)
Maruyama, Isao, Shibata, Naokazu, Ueda, Kazuo
With the Finite temperature Density Matrix Renormalization Group method (FT-DMRG), we depeloped a method to calculate thermo-dynamical quantities and the conductance of a quantum dot system....
Kondo hole in one-dimensional Kondo insulators (2004)
Maruyama, Isao, Shibata, Naokazu, Ueda, Kazuo
Properties of a nonmagnetic impurity in Kondo insulators are investigated by considering a one-dimensional Kondo lattice model with depletion of a localized spin. The ground-state phase diagram...
Honjoh, Ken-ichi, Suga, Koushirou, Shinohara, Fuminori, Maruyama, Isao, Miyamoto, Takahisa, Hatano, Shoji, ...
Protoplasts from Chlorella vulgaris K-73112 were obtained by enzymatic digestion with a mixture of Acromopeptidase, Cellulase ONOZUKA R-10, Chitosanas Kl, Gluczyme, and Uskizyme. The formation of...