...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical Review X >Vacancy-Induced Low-Energy Density of States in the Kitaev Spin Liquid
【24h】

Vacancy-Induced Low-Energy Density of States in the Kitaev Spin Liquid

机译：在Kitaev旋转液体中空位诱导的状态低能量密度

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Kitaev honeycomb model has attracted significant attention due to its exactly solvable spin-liquid ground state with fractionalized Majorana excitations and its possible materialization in magnetic Mott insulators with strong spin-orbit couplings. Recently, the 5 d -electron compound H 3 LiIr 2 O 6 has shown to be a strong candidate for Kitaev physics considering the absence of any signs of a long-range ordered magnetic state. In this work, we demonstrate that a finite density of random vacancies in the Kitaev model gives rise to a striking pileup of low-energy Majorana eigenmodes and reproduces the apparent power-law upturn in the specific heat measurements of H 3 LiIr 2 O 6 . Physically, the vacancies can originate from various sources such as missing magnetic moments or the presence of nonmagnetic impurities (true vacancies), or from local weak couplings of magnetic moments due to strong but rare bond randomness (quasivacancies). We show numerically that the vacancy effect is readily detectable even at low vacancy concentrations and that it is not very sensitive either to the nature of vacancies or to different flux backgrounds. We also study the response of the site-diluted Kitaev spin liquid to the three-spin interaction term, which breaks time-reversal symmetry and imitates an external magnetic field. We propose a field-induced flux-sector transition where the ground state becomes flux-free for larger fields, resulting in a clear suppression of the low-temperature specific heat. Finally, we discuss the effect of dangling Majorana fermions in the case of true vacancies and show that their coupling to an applied magnetic field via the Zeeman interaction can also account for the scaling behavior in the high-field limit observed in H 3 LiIr 2 O 6 .
机译：Kitaev Honeycomb Models由于其完全可溶性的旋转液体接地状态而引起了显着的关注，其具有厚度的Majorana激励及其具有强大的自旋轨道联轴器的磁性薄膜绝缘体中可能的实现。最近，5 d -electron化合物H 3 Lir 2 O 6已经显示为Kitaev物理的强烈候选者，考虑不存在远程有序磁状态的任何迹象。在这项工作中，我们证明了Kitaev模型中的随机空缺的有限密度导致低能量Majorana特征模点的醒目堆，并在H 3 Lir 2 O 6的特定热测量中再现表观动力法升高。物理上，空缺可以源自各种来源，例如缺失的磁矩或非磁性杂质（真实空位），或由于强且罕见的键随机性（Quasivacies），磁矩的局部弱偶联。我们在数值上表明空缺效应即使在低空位浓度下也可以易于检测，并且对于空缺的性质或不同的磁通背景而不是非常敏感。我们还研究了站点稀释的Kitaev旋转液体到三个自旋相互作用项的响应，其断开时间反转对称性并模仿外部磁场。我们提出了一种现场诱导的磁通扇形转变，其中接地状态变为无通量的较大场，导致透明抑制低温比热。最后，我们讨论了在真正空位的情况下悬空的Maveana Fermions的效果，并表明它们通过塞曼交互与应用磁场的耦合也可以解释在H 3 Lir 2 O中观察到的高场限制中的缩放行为6。

著录项

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