强磁场下三维量子螺旋磁网络基态相位的稀玻色气体方法
Dilute-Bose-Gas Approach to ground state phases of 3D quantum helimagnets under high magnetic field
摘要：
本文研究了三维量子螺旋磁体的高场相图和低能激发。在略低于饱和场的情况下，磁序的出现可以在数学上被看作是磁振子的玻色-爱因斯坦凝聚（BEC）。利用稀释玻色气体的方法，对三维螺旋磁网的量子效应进行了无偏定量分析，发现了三个相：锥相、共面扇相和吸引主导相.为了研究最后一个阶段，我们扩展了通常的BEC方法，使我们可以处理2-磁振子束缚态。在2-磁振子BEC的情况下，横向磁化消失和长程序发生在四极通道（自旋极化相）。作为一个应用，我们绘制了一个三维helimagnet的相图，它由阻挫J1-J2链耦合的链间相互作用J3。
英文摘要：
We study high-field phase diagram and low-energy excitations of three-dimensional quantum helimagnets. Slightly below the saturation field, the emergence of magnetic order may be mathematically viewed as Bose-Einstein condensation (BEC) of magnons. The method of dilute Bose gas enables an unbiased quantitative analysis of quantum effects in three-dimensional helimagnets and thereby three phases are found: cone, coplanar fan and an attraction-dominant one. To investigate the last phase, we extend the usual BEC approach so that we can handle 2-magnon bound states. In the case of 2-magnon BEC, the transverse magnetization vanishes and long-range order occurs in the quadrupolar channel (spin-nematic phase). As an application, we map out the phase diagram of a 3D helimagnet which consists of frustrated J1-J2 chains coupled by an interchain interaction J3.
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