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Charge-parity symmetry observed through Friedel oscillations in chiral charge-density waves

机译:通过手性电荷密度波中的Friedel振荡观察到的电荷奇偶性对称性

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摘要

We discovered a chiral behavior of Friedel oscillations (FOs), which have both triangular symmetry and inverse chirality from chiral charge-density waves (CDWs) in 1T-TiSe2 by using scanning tunneling microscopy (STM). Surprisingly, the existence of FOs with the opposite chirality to the underlying CDWs suggests that the excess electron induced by impurity reduces the local helicity of CDWs without CDW breaking. This FOs can be explained with a two-branch model with different chiralities, which permits excitation from one branch to another, that is, Dirac-type dispersion. Moreover, we found two states that correspond to electron addition and electron removal. In terms of the chirality of electrons, these two states are the same. This result provides an evidence for the charge-parity (CP) symmetry conservation in CDW systems.
机译:我们通过使用扫描隧道显微镜(STM)从1T-TiSe2中的手性电荷密度波(CDWs)中发现了具有三角形对称性和反手性的弗里德尔振荡(FOs)的手性行为。令人惊讶的是,与下面的CDW具有相反手性的FO的存在表明,杂质诱导的过量电子会降低CDW的局部螺旋度,而不会破坏CDW。可以用具有不同手性的两分支模型来解释此FO,该模型允许从一个分支激发到另一个分支,即狄拉克型分散。此外,我们发现了两个状态,分别对应于电子的添加和电子的去除。就电子的手性而言,这两个状态是相同的。这一结果为CDW系统中电荷奇偶性(CP)对称性守恒提供了证据。

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  • 来源
    《Physical review》 |2011年第24期|p.245125.1-245125.5|共5页
  • 作者单位

    Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan;

    Department of Physics, Asahikawa Medical College, Asahikawa 078-8510, Japan;

    Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan;

    Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan,Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628, Japan;

    Department of Physics, Hokkaido University, Sapporo 060-0810, Japan;

    Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628, Japan,Department of Physics, Hokkaido University, Sapporo 060-0810, Japan;

    Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan,Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628, Japan;

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

    charge-density-wave systems; scanning tunneling microscopy (including chemistry induced with STM); transition-metal compounds; broken symmetry phases;

    机译:电荷密度波系统;扫描隧道显微镜(包括用STM诱导的化学反应);过渡金属化合物;破碎的对称相;

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