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arXiv 2212.04863cond-mat.str-el
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正方晶格上自旋1/2 J1-J2 XY模型中的 plaquette 价键态

Plaquette valence bond state in spin-1/2 J1-J2 XY model on square lattice

Y. -H. Chan, Hong-Chen Jiang, Y. -C. Chen

AI总结:

本研究用iDMRG和DMRG方法研究正方晶格自旋1/2 J1-J2 XY模型基态相图,发现中间参数区存在plaquette价键相,且未观测到量子自旋液相的数值证据。

摘要:

我们采用iDMRG(无限密度矩阵重整化群)和DMRG(密度矩阵重整化群)两种方法,研究了具有最近邻J1、次近邻J2反铁磁相互作用的正方晶格自旋1/2 J1-J2 XY模型的基态相图。研究表明,在J2/J1<0.50的Néel磁有序相与J2/J1≥0.54的条纹磁有序相之间的中间区域(0.50≤J2/J1≤0.54),存在plaquette价键相。该plaquette价键相的特征是水平和垂直方向均存在有限二聚序。与自旋1/2 J1-J2 Heisenberg模型不同,我们未在J1-J2 XY模型中找到量子自旋液相的数值证据。

英文摘要:

We studied the ground state phase diagram of spin-1/2 J1-J2 XY model on the square lattice with first- J1 and second-neighbor J2 antiferromagnetic interactions using both iDMRG and DMRG approaches. We show that a plaquette valence bond phase is realized in an intermediate region 0.50 <= J2/J1 <= 0.54 between a Néel magnetic ordered phase at J2/J1 < 0.50 and a stripy magnetic ordered phase at J2/J1 >= 0.54. The plaquette valence bond phase is characterized by finite dimer orders in both the horizontal and vertical directions. Contrary to the spin-1/2 J1-J2 Heisenberg model, we do not find numerical evidence for a quantum spin liquid phase in the J1-J2 XY model.

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。

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