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Quantum phases of a frustrated spin-1 system: The 5/7 skewed ladder
Physical Review B ( IF 3.2 ) Pub Date : 2021-09-27 , DOI: 10.1103/physrevb.104.125138
Sambunath Das 1 , Dayasindhu Dey 1 , Manoranjan Kumar 2 , S. Ramasesha 1
Affiliation  

The quantum phases in a spin-1 skewed ladder system formed by alternately fusing five- and seven-membered rings are studied numerically using the exact diagonalization technique up to 16 spins and using the density matrix renormalization group method for larger system sizes. The ladder has a fixed isotropic antiferromagnetic (AF) exchange interaction (J2=1) between the nearest-neighbor spins along the legs and a varying isotropic AF exchange interaction (J1) along the rungs. As a function of J1, the system shows many interesting ground states (gs) which vary from different types of nonmagnetic and ferrimagnetic gs. The study of various gs properties such as spin gap, spin-spin correlations, spin density, and bond order reveal that the system has four distinct phases, namely, the AF phase at small J1; the ferrimagnetic phase with gs spin SG=n for 1.44<J1<4.74 and with SG=2n for J1>5.63, where n is the number of unit cells; and a reentrant nonmagnetic phase at 4.74<J1<5.44. The system also shows the presence of spin current at specific J1 values due to simultaneous breaking of both reflection and spin parity symmetries.

中文翻译:

受挫自旋 1 系统的量子相:5/7 斜梯

使用多达 16 个自旋的精确对角化技术和对更大系统尺寸使用密度矩阵重整化群方法对由交替融合五元环和七元环形成的自旋 1 斜梯系统中的量子相进行数值研究。梯子具有固定的各向同性反铁磁(AF)交换相互作用(J2=1) 沿腿的最近邻自旋和不同的各向同性 AF 交换相互作用之间 (J1) 沿着梯级。作为函数J1,该系统显示了许多有趣的基态 (gs),这些基态 (gs) 因不同类型的非磁性和亚铁磁性 gs 而异。对自旋间隙、自旋-自旋相关性、自旋密度和键序等各种 gs 性质的研究表明,该体系具有四个不同的相,即小J1; 具有 gs 自旋的亚铁磁相G=n 为了 1.44<J1<4.74G=2n 为了 J1>5.63, 在哪里 n是单元格的数量;和一个可重入的非磁性相4.74<J1<5.44. 该系统还显示了特定条件下自旋电流的存在J1 由于同时破坏反射和自旋奇偶对称性而产生的值。
更新日期:2021-09-28
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