94 citations · 511 across the 15 of their papers we have counts for
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Phase diagram of S=1/2 two-leg XXZ spin ladder systems
K. Hijii, A. Kitazawa, K. Nomura
We investigate the ground state phase diagram of the S=1/2 two-leg spin ladder system with an isotropic interchain coupling. In this model, there is the Berezinskii-Kosterlit…
BKT transition and level spectroscopy
Kiyohide Nomura, Atsuhiro Kitazawa
Berezinskii-Kosterlitz-Thouless (BKT) transition is one of the instability mechanisms for the Tomonaga-Luttinger liquid. But in the BKT transition, there are logarithmic-correction…
Spin-Gap Phases in Tomonaga-Luttinger Liquids
Masaaki Nakamura, Atsuhiro Kitazawa, Kiyohide Nomura
We give the details of the analysis for critical properties of spin-gap phases in one-dimensional lattice electron models. In the Tomonaga-Luttinger (TL) liquid theory, the spin-ga…
Renormalization group analysis of the spin-gap phase in the one-dimensional t-J model
Masaaki Nakamura, Kiyohide Nomura, Atsuhiro Kitazawa
We study the spin-gap phase in the one-dimensional t-J model, assuming that it is caused by the backward scattering process. Based on the renormalization group analysis and symmetr…
Phase Diagram of S=1 Bond-Alternating XXZ Chains Reflecting the Hidden Z_2\times Z_2 Symmetry
Atsuhiro Kitazawa, Kiyohide Nomura
The phase diagram of the spin-1 bond-alternating XXZ chain is studied numerically. This model is appropriate to study the VBS picture and the hidden Z_2\times Z_2 symmetry concerni…