308 citations · 5.9k across the 170 of their papers we have counts for
4 papers · 1 filter
Critical Properties of One-Dimensional Electron Systems with -type Long-Range Interactions
Yasumasa Tsukamoto, Norio Kawakami
We study the critical properties of one-dimensional electron systems with the -type long-range interaction (). Using bosonization methods, we discuss how the 1D syst…
Excitation Spectrum for Quantum Spin Systems with Ladder, Plaquette and Mixed-Spin Structures
Akihisa Koga, Norio Kawakami
By using the series expansion techniques, we study the excitation spectrum for the two-dimensional quantum spin systems with ladder, plaquette and mixed-spin structures. We calcula…
Mixed-spin cluster expansion for a quasi-one-dimensional Haldane system
Akihisa Koga, Norio Kawakami
We present a novel mixed-spin cluster expansion method for a quasi-one-dimensional Haldane system with bond alternation. By mapping the s=1 antiferromagnetic spin model on square a…
Quantum Phase Transitions in Two-Dimensional Spin Systems with Ladder, Plaquette and Mixed-Spin Structures
A. Koga, S. Kumada, N. Kawakami
Quantum phase transitions between the magnetically ordered and disordered states are studied for the two-dimensional antiferromagnetic quantum spin systems with ladder, plaquette,…