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Spin nematics next to spin singlets

机译:在旋转单重态旁边旋转向列

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摘要

We provide a route to generate nematic order in a spin-1/2 system. Unlike the well-known magnon-binding mechanism, our spin nematics requires neither the frustration effect nor spin polarization in a high field or in the vicinity of a ferromagnet, but instead appears next to the spin singlet phase. We start from a state consisting of a quantum spin-1/2 singlet dimer placed on each site of a triangular lattice, and show that interdimer ring exchange interactions efficiently dope the SU(2) triplets that itinerate and interact, easily driving a stable singlet state to either Bose-Einstein condensates or a triplet crystal, some hosting a spin nematic order. A variety of roles the ring exchange serves includes the generation of a bilinear-biquadratic interaction between nearby triplets, which is responsible for the emergent nematic order separated from the singlet phase by a first-order transition.
机译:我们提供了在旋转1/2系统中生成向列顺序的途径。与众所周知的磁振子束缚机制不同,我们的自旋向列相既不需要抑制作用,也不需要在高磁场或铁磁体附近的自旋极化,而是出现在自旋单重态相旁边。我们从由放置在三角晶格的每个位置上的量子自旋1/2单重态二聚体组成的状态开始,并显示二聚体环交换相互作用有效地掺杂了会迭代和相互作用的SU(2)三胞胎,轻松驱动稳定的单重态呈Bose-Einstein凝聚态或三重态晶体,其中一些呈自旋向列相。环交换所起的各种作用包括在附近的三胞胎之间产生双线性-双二次相互作用,这负责通过一阶跃迁从单峰相中分离出的新兴向列相。

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  • 来源
    《Physical review》 |2018年第18期|180404.1-180404.5|共5页
  • 作者

    Yuto Yokoyama; Chisa Hotta;

  • 作者单位

    Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan;

    Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan;

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