标题： 一种用于三角晶格上自旋1/2反铁磁海森堡模型的非线性自旋波理论 显示英文标题

标题： A novel nonlinear spin wave theory for the spin 1/2 antiferromagnetic Heisenberg model on a triangular lattice

摘要： 我们扩展了非线性自旋波理论（NLSWT）用于三角晶格上的自旋1/2反铁磁海森堡模型（TAFHM）。这种新NLSWT考虑了比线性自旋波理论（LSWT）高一阶的1/S修正。它还区分了在何种情况下负能激发，即LSWT失效的符号，可以通过玻色子正常排序和自洽迭代被重归一化为正数。我们通过测试不同参数下各种磁序的稳定性来绘制相图。特别是，我们的研究发现非公度配置是不稳定的。共线配置的新相变点（PTP）与各种先前的研究结果非常一致。 显示英文摘要

摘要： We extend the nonlinear spin wave theory (NLSWT) for the spin 1/2 antiferromagnetic Heisenberg model on a triangular lattice (TAFHM). This novel NLSWT considers the corrections one order higher in 1/S than the linear spin wave theory (LSWT). It also distinguishes in which circumstance the negative energy excitation, the sign of the breakdown of LSWT, shall be renormalized to be positive both by a boson normal ordering and a self-consistent iteration. We draw a phase diagram by testing the stability of various magnetic orders for different parameters. In particular, the incommensurate configuration is found unstable by our study. The new phase transition point (PTP) of the collinear configuration agrees well with various previous studies.