...
首页> 外文期刊>Physical review >General quantum fidelity susceptibilities for the J_1- J_2 chain
【24h】

General quantum fidelity susceptibilities for the J_1- J_2 chain

机译:J_1-J_2链的一般量子保真度

获取原文
获取原文并翻译 | 示例
           

摘要

We study slightly generalized quantum fidelity susceptibilities where the differential change in the fidelity is measured with respect to a different term than the one used for driving the system toward a quantum phase transition. As a model system we use the spin-1/2 J_1-J_2 antiferromagnetic Heisenberg chain. For this model, we study three fidelity susceptibilities, x_p. x_d, and x_AF, which are related to the spin stiffness, the dimer order, and antiferromagnetic order, respectively. All these ground-state fidelity susceptibilities are sensitive to the phase diagram of the J_1-J_2 model. We show that they all can accurately identify a quantum critical point in this model occurring at J_2~c ~ 0.241 J_1 between a gapless Heisenberg phase for J_2 < J_2~c and a dimerized phase for J_2 > J_2~c. This phase transition, in the Berezinskii-Kosterlitz-Thouless universality class, is controlled by a marginal operator and is therefore particularly difficult to observe.
机译:我们研究了略微广义化的量子保真度磁化率,其中相对于与用于驱动系统朝着量子相变的术语不同的项,测量了保真度的差分变化。作为模型系统,我们使用自旋1/2 J_1-J_2反铁磁海森堡链。对于此模型,我们研究了三个保真度敏感性x_p。 x_d和x_AF分别与自旋刚度,二聚体级和反铁磁级有关。所有这些基态保真度敏感性都对J_1-J_2模型的相图敏感。我们表明,他们都可以准确识别该模型中的一个量子临界点,该临界点出现在J_2 J_2〜c的二聚相之间的J_2〜c〜0.241 J_1处。在Berezinskii-Kosterlitz-Thouless普遍性类别中,此相变受边际算符控制,因此特别难以观察。

著录项

  • 来源
    《Physical review》 |2011年第22期|p.224435.1-224435.6|共6页
  • 作者单位

    Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4M1;

    Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4M1;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spin chain models; phase transitions: general studies;

    机译:自旋链模型;相变:常识;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号