论文标题
在Spin-1/2 J1-J2 XY模型中的Plaquette Valence键态在方格上
Plaquette valence bond state in spin-1/2 J1-J2 XY model on square lattice
论文作者
论文摘要
我们使用IDMRG和DMRG方法研究了与第一neighbor J1和第二个邻居J2抗铁磁相互作用的Spin-1/2 J1-J2 XY模型的基态相图。我们表明，在中间区域0.50 <= j2/j1 <= 0.54在J2/J1 <0.50和J2/J1> = 0.54处的条纹磁有序相。 Plaquette Valence键相的特征是水平和垂直方向上的有限二聚体顺序。与Spin-1/2 J1-J2 Heisenberg模型相反，我们找不到J1-J2 XY模型中量子自旋液相的数值证据。
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.
