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Probing zero modes of a defect in a Kitaev quantum wire

机译:探索Kitaev量子线中缺陷的零模

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摘要

The Kitaev quantum wire (KQW) model with open boundary possesses two Majorana edge modes. When the local chemical potential on a defect site is much higher than that on other sites and than the hopping energy, the electron hopping is blocked at this site. We show that the existence of such a defect on a closed KQW also gives rise to two low-energy modes, which can simulate the edge modes. The energies of the defect modes vanish to zero as the local chemical potential of the defect increase to infinity. We develop a quantum Langevin equation to study the transport of KQW for both open and closed cases. We find that when the lead is contacted with the site beside the defect, we can observe two splitted peaks around the zero-bias voltage in the differential conductance spectrum, whereas if the lead is contacted with the bulk of the quantum wire far from the the defect or the open edges, we cannot observe any zero-bias peak.
机译:具有开放边界的Kitaev量子线(KQW)模型具有两个Majorana边缘模式。当缺陷部位的局部化学势远高于其他部位的化学势且比跳跃能高时,电子跃迁在该部位受阻。我们表明,在封闭的KQW上这种缺陷的存在还引起了两个低能模式,它们可以模拟边缘模式。随着缺陷的局部化学势增加到无穷大,缺陷模式的能量消失为零。我们开发了一个量子Langevin方程来研究KQW在开闭情况下的传输。我们发现,当铅与缺陷旁边的位置接触时,我们可以在差分电导谱中的零偏电压附近观察到两个分裂的峰,而如果铅与远离量子点的大部分量子线接触,缺陷或开放边缘,我们无法观察到任何零偏峰。

著录项

  • 来源
    《Physical review》 |2014年第13期|134505.1-134505.8|共8页
  • 作者单位

    Beijing Computational Science Research Center, Beijing 100084, China,School of Engineering and Information Technology, University of New South Wales at the Australian Defense Force Academy, Canberra, ACT 2600, Australia,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;

    Beijing Computational Science Research Center, Beijing 100084, China;

    Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China,State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, University of Chinese Academy of Sciences, Beijing 100190, China;

    Beijing Computational Science Research Center, Beijing 100084, China,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;

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

    tunneling phenomena; point contacts, weak links, josephson effects; electronic transport in mesoscopic systems; mesoscopic and nanoscale systems;

    机译:隧道现象;点接触;薄弱环节;约瑟夫森效应;介观系统中的电子传输;介观和纳米系统;

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