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arXiv 2007.10414cond-mat.str-elcond-mat.stat-mech
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开自旋链中多体边态和扩展量子态的拓扑:1/3-平台、Kosterlitz-Lusterless跃迁和Luttinger液体

Topology of many-body edge and extended quantum states in an open spin chain: 1/3--plateau, Kosterlitz-Thouless transition, and Luttinger liquid

R. R. Montenegro-Filho, F. S. Matias, M. D. Coutinho-Filho

摘要:

利用密度矩阵重整化群和精确对角化方法,研究了磁场$h$中开AB $_2$链上各向异性海森堡模型1/3平台的量子多体边和扩展磁振子激发.通过调整富相图中的各向异性和$h$,边缘态穿透到体中,其间隙在受保护的拓扑Kosterlitz-无间隙转变中闭合。此外,我们还观察到了压缩链效应,边缘态简并的破坏,以及当各向异性$λ$从相图的$λ>0$侧接近临界点时,Luttinger液体无带隙相中从具有二次长波长色散的带隙磁振子到线性自旋色散的激发的拓扑变化。

英文摘要:

Quantum many-body edge and extended magnon excitations from the 1/3 -- plateau of the anisotropic Heisenberg model on an open AB$_2$ chain in a magnetic field $h$ are unveiled using the density matrix renormalization group and exact diagonalization. By tuning both the anisotropy and $h$ in the rich phase diagram, the edge states penetrate in the bulk, whose gap closes in a symmetry-protected topological Kosterlitz-Thouless transition. Also, we witness the squeezed chain effect, the breaking of the edge states degeneracy, and a topological change of the excitations from gapped magnons with quadratic long-wavelength dispersion to a linear spinon dispersion in the Luttinger liquid gapless phase as the anisotropy $λ$ approaches the critical point from the $λ>0$ side of the phase diagram.

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