arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1812.04656cond-mat.str-el
收藏

修正Ising链中的反常畴壁凝聚

Anomalous domain wall condensation in a modified Ising chain

Gertian Roose, Laurens Vanderstraeten, Jutho Haegeman, Nick Bultinck

摘要:

我们构建了一个一维的本地自旋哈密顿量的内在非本地的,因此异常,全球$\mathbb{Z}_2$对称性。该模型与横向磁场中的量子伊辛模型密切相关,并且包含一个可以被调谐以自发打破非局部$\mathbb{Z}_2$对称性的参数。哈密顿量的构造,以捕捉在对称性破缺阶段的畴壁的非常规性质。利用均匀矩阵乘积态,我们得到了凝聚畴壁的相图。我们发现,完整的相图包括一个无隙相,从有序的铁磁相分离的Berezinskiii-Kosterlitz-无隙过渡,并从有序的反铁磁相的第一阶相变。

英文摘要:

We construct a one-dimensional local spin Hamiltonian with an intrinsically non-local, and therefore anomalous, global $\mathbb{Z}_2$ symmetry. The model is closely related to the quantum Ising model in a transverse magnetic field, and contains a parameter that can be tuned to spontaneously break the non-local $\mathbb{Z}_2$ symmetry. The Hamiltonian is constructed to capture the unconventional properties of the domain walls in the symmetry broken phase. Using uniform matrix product states, we obtain the phase diagram that results from condensing the domain walls. We find that the complete phase diagram includes a gapless phase that is separated from the ordered ferromagnetic phase by a Berezinskii-Kosterlitz-Thouless transition, and from the ordered antiferromagnetic phase by a first order phase transition.

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。

↑