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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…
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 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…
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…