Magnetization and dimerization profiles of the cut two-leg spin ladder

Article

关键词: MATRIX RENORMALIZATION-GROUP;    2-DIMENSIONAL ISING-MODEL;    HEISENBERG ANTIFERROMAGNETIC CHAINS;    NON-ABELIAN BOSONIZATION;    BOND GROUND-STATES;    MEAN-FIELD THEORY;    HALDANE-GAP;    FINITE-TEMPERATURE;    FRACTIONAL-SPIN;    EDGE STATES;   

DOI  :  10.1103/PhysRevB.65.174406

来源: SCIE

【 摘 要 】

The physical properties of the edge states of the cut two-leg spin ladder are investigated by means of the bosonization approach. By carefully treating boundary conditions, we derive the existence of spin-1/2 edge states in the spin ladder with a ferromagnetic rung exchange and for the open spin-1 Heisenberg chain. In contrast, such states are absent in the antiferromagnetic rung coupling case. The approach, based on a mapping onto decoupled semi-infinite off-critical Ising models, allows us to compute several physical quantities of interest. In particular, we determine the magnetization and dimerization profiles of the cut two-leg spin ladder and of the open biquadratic spin-1 chain in the vicinity of the SU(2)(2) Wess-Zumino-Novikov-Witten critical point.

【 授权许可】

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