In Chapter Three, we study the properties of low-energy magnetic excitations of the two-dimensional collinear antiferro-magnet, based on the frustrated two-dimensional Heisenberg J1-J2 model.

• 在第三章，我们在有阻挫的二维海森堡J1-J2模型的基础上，分析了低温下的二维条纹状反铁磁态的磁性激发性质。