94 citations · 511 across the 15 of their papers we have counts for
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Magnetization-plateau state of the S=3/2 spin chain with single ion anisotropy
Atsuhiro Kitazawa, Kiyomi Okamoto
We reexamine the numerical study of the magnetized state of the S=3/2 spin chain with single ion anisotropy D(> 0) for the magnetization M=M_{S}/3, where M_{S} is the saturation ma…
Breakdown of the magnetization plateau of the S=1/2 ferromagnetic-ferromagnetic-antiferromagnetic trimerized spin chain with anisotropy
Atsuhiro Kitazawa, Kiyomi Okamoto
We study the breakdown of the magnetization plateau at the magnetization M=M_{S}/3 (M_{S} is the saturation magnetization) of the S=1/2 anisotropic spin chain with ferromagnetic-fe…
Quantum Phase Transition of S=1/2 Trimerized XXZ Spin Chain in Magnetic Field
Kiyomi Okamoto, Atsuhiro Kitazawa
We study the magnetization plateau at a third of the saturation magnetization of the S=1/2 trimerized XXZ spin chain at T=0. The appearance of the plateau depends on the values of…
Bifurcation at the c=3/2 Takhtajan-Babujian point to the c=1 critical lines
Atsuhiro Kitazawa, Kiyohide Nomura
We study the S=1 quantum spin chains with bilinear, biquadratic, plus bond alternation in the vicinity of the S=1 Takhtajan-Babujian model. Transition line between the Haldane and…
Magnetization plateau and quantum phase transition of the S=1/2 trimerized XXZ spin chain
Kiyomi Okamoto, Atsuhiro Kitazawa
We study the plateau of the magnetization curve at ( is the saturation magnetization) of the trimerized spin chain. By examining the leve…
symmetry of the BKT transition and twisted boundary conditio n
Kiyohide Nomura, Atsuhiro Kitazawa
Berezinskii-Kosterlitz-Thouless (BKT) transition, the transition of the 2D sine-Gordon model, plays an important role in the low dimensional physics. We relate the operator content…
Phase Diagrams of S=3/2, 2 XXZ Spin Chains with Bond-Alternation
Atsuhiro Kitazawa, Kiyohide Nomura
We study the phase diagram of S=3/2 and S=2 bond-alternating spin chains numerically. In previous papers, the phase diagram of S=1 XXZ spin chain with bond-alternation was shown to…