严格对角化方法对S=1/2自旋阶梯模型的研究

Exact diagonalization studies of the spin=1/2 Heisenberg Ladder

本文使用严格对角化方法对S=1/2自旋阶梯模型进行了数值模拟计算研究,通过对不同长度自旋阶梯中两条单链和链间耦合部分各自对基态能量、能隙的贡献比例和自旋关联的考察,认为该系统处于自旋液体状态,同时模拟计算的结果对沿链方向形成交错磁场的假设提出了质疑。

In current paper, the s=1/2 Antiferromagnetic Spin Ladder (AFSL) system is numerically investigated by using Exact Diagonalize method. When considering the ground energy and the energy gap of the system, the contribution from chains and rungs are respective evalued for ladders of different length. The spin-spin correlations along chain is calculated too. All of the results obtained are consistent with the Spin Liquid Theory. The Previous assumption that formation of staggered magnetic field along chains which induced by interchains interaction is not confirmed in current simulation.