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Quantum Phase Transitions in 1/3 Plateau of the Quantum Spin Tube
Kouichi Okunishi,Masahiro Sato,Tˆoru Sakai,Kiyomi Okamoto,Chigaku Itoi,이진형 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study quantum phase transitions in the 1/3 plateau state of the three-leg spin-1/2 tube,where the low-energy effective chirality degree of freedom plays an essential role. Using the densitymatrix renormalization group and the effective chirality model, we find that, as the leg couplingincreases, the chirality liquid, a novel spin imbalance phase and the vector-spin-chirality orderedphase emerge without closing the plateau spin gap. We also clarify the role of the S3-symmetry ofthe spin tube, behind these quantum phase transitions.
Toru Sakai,Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Kouichi Okunishi 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 ferromagnetic and antiferromagnetic bond-alternating chain with competing anisotropies is investigated using the numerical diagonalization of finite-size systems. It is found that when the easy-plane and easy-axis anisotropies are introduced at the ferromagnetic and antiferromagnetic bonds, respectively, the system possibly exhibits the 1/2 magnetization plateau with the spontaneous translational symmetry breaking. The phase diagrams with respect to the two anisotropies are presented.