21 citations · 67 across the 10 of their papers we have counts for
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Uniform Matrix Product State in the Thermodynamic Limit
Hiroshi Ueda, Isao Maruyama, Kouichi Okunishi
We study a uniform matrix product state as a variational state for classical and quantum spin chains in the thermodynamic limit. Under a careful treatment of the translational symm…
Edge states of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange
Mitsuhiro Arikawa, Shou Tanaya, Isao Maruyama +1
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…
Quantized Berry Phases of a Spin-1/2 Frustrated Two-Leg Ladder with Four-Spin Exchange
I. Maruyama, T. Hirano, Y. Hatsugai
A spin-1/2 frustrated two-leg ladder with four-spin exchange interaction is studied by quantized Berry phases. We found that the Berry phase successfully characterizes the Haldane…
Topological Aspects of Surface States in Semiconductors
Yoshihiro Kuge, Isao Maruyama, Yasuhiro Hatsugai
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 topologic…
Nontrivial quantized Berry phases for itinerant spin liquids
Isao Maruyama, Yasuhiro Hatsugai
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-A…
U(1) symmetry breaking in one-dimensional Mott insulator studied by the Density Matrix Renormalization Group method
Isao Maruyama, Tetsuji Koide, Yasuhiro Hatsugai
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 metho…