arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0902.2266cond-mat.othercond-mat.str-elquant-ph
收藏

二聚自旋链的基态因子分解和量子相变

Ground-state factorization and quantum phase transition in dimerized spin chains

Gian Luca Giorgi

摘要:

研究了横场中二聚$XY$自旋链的基态因子分解。除了通常的铁磁和反铁磁机制,还出现了第三种情况,这种情况在自旋不变系统中没有类似的情况,它由反铁磁尼尔型基态组成,其中自旋对代表幺正晶胞。然后,我们计算了模型的精确解,并证明了因式分解场是哈密顿量的一个偶然简并点。最后,我们将基态因子分解的存在性研究扩展到更一般的一类模型。

英文摘要:

We study the occurrence of ground-state factorization in dimerized $XY$ spin chains in a transverse field. Together with the usual ferromagnetic and antiferromagnetic regimes, a third case emerges, with no analogous in translationally-invariant systems, consisting of an antiferromagnetic Neél-type ground state where pairs of spins represent the unitary cell. Then, we calculate the exact solution of the model and show that the factorizing field represent an accidental degeneracy point of the Hamiltonian. Finally, we extend the study of the existence of ground-state factorization to a more general class of models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑