...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Spiral antiferromagnets beyond the spin-wave approximation: Frustrated XY and Heisenberg models on the honeycomb lattice
【24h】

Spiral antiferromagnets beyond the spin-wave approximation: Frustrated XY and Heisenberg models on the honeycomb lattice

机译：超越自旋波近似的螺旋反铁磁体：蜂窝晶格上的失意XY和Heisenberg模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We examine the stability of classical states with a generic incommensurate spiral order against quantum fluctuations. Specifically, we focus on the frustrated spin-1/2 XY and Heisenberg models on the honeycomb lattice with nearest-neighbor J_1 and next-nearest-neighbor J_2 antiferromagnetic couplings. Our variational approach is based on the Jastrow wave functions, which include quantum correlations on top of classical spin waves. We perform a systematic optimization of wave vectors and Jastrow pseudopotentials within this class of variational states and find that quantum fluctuations favor collinear states over generic coplanar spirals. The Neel state with Q = (0,0) extends its stability well beyond the classical value J_2/J_1 = 1/6. Most importantly, the collinear states with Q = (0,27π/3~(1/2)) (and the two symmetry-related states) are found to be stable in a large regime with intermediate frustration, while at the classical level they are limited to the point J_2/J_1 = 0.5. For large frustration, the 120° state is stabilized for finite values of J_2/J_1 in both models.
机译：我们用经典的不相称的螺旋阶对量子涨落检验了经典状态的稳定性。具体来说，我们集中在蜂窝晶格上受挫的spin-1 / 2 XY模型和Heisenberg模型，其中最近邻居J_1和最近邻居J_2反铁磁耦合。我们的变分方法基于Jastrow波函数，其中包括经典自旋波之上的量子相关性。我们对这类变分状态内的波矢量和Jastrow伪势进行了系统的优化，发现与通用共面螺旋相比，量子涨落更倾向于共线态。 Q =（0,0）的Neel态将其稳定性大大扩展到经典值J_2 / J_1 = 1/6。最重要的是，发现在Q =（0,27π/ 3〜（1/2））的共线态（以及两个与对称有关的态）在大范围内具有中等挫败感时是稳定的，而在经典水平上它们是稳定的。限于点J_2 / J_1 = 0.5。对于较大的挫败感，两个模型中的J_2 / J_1的有限值均稳定在120°状态。

著录项

  • 来源
    《Physical review》 |2014年第9期|094413.1-094413.9|共9页
  • 作者

    Andrea Di Ciolo; Juan Carrasquilla; Federico Becca; Marcos Rigol; Victor Galitski;

  • 作者单位

    Joint Quantum Institute and Department of Physics, University of Maryland, College Park, 20742, USA;

    Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada N2L 2Y5,Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Democritos National Simulation Center, Istituto Officina dei Materiali del CNR and SISSA-International School for Advanced Studies, Via Bonomea 265,I-34136 Trieste, Italy;

    Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Joint Quantum Institute and Department of Physics, University of Maryland, College Park, 20742, USA;

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

    quantized spin models; quantum monte carlo methods;

    机译：量化自旋模型量子蒙特卡洛方法;

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