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首页> 外文期刊>Physical review >Relationship between Fermi surface warping and out-of-plane spin polarization in topological insulators: A view from spin- and angle-resolved photoemission
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Relationship between Fermi surface warping and out-of-plane spin polarization in topological insulators: A view from spin- and angle-resolved photoemission

机译：拓扑绝缘体中费米表面翘曲与面外自旋极化之间的关系：自旋和角度分辨光发射的视角

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摘要

We have performed spin- and angle-resolved photoemission spectroscopy of the topological insulator Pb(Bi,Sb)_2Te_4 and observed significant out-of-plane spin polarization on the hexagonally warped Dirac-cone surface state. To put this into context, we carried out quantitative analysis of the warping strengths for various topological insulators [Pb(Bi,Sb)_2Te_4, Bi_2Te_3, Bi_2Se_3, and TlBiSe_2] and elucidated that the out-of-plane spin polarization P_z is systematically correlated with the warping strength. However, the magnitude of P_z is found to be only half that expected from the k·p theory when the warping is strong. Besides confirming a universal relationship between the spin polarization and the surface state structure, our data provide an empirical guiding principle for tuning the spin polarization in topological insulators.
机译：我们对拓扑绝缘体Pb（Bi，Sb）_2Te_4进行了自旋和角度分辨光发射光谱，并在六角形翘曲的狄拉克锥表面状态下观察到了明显的面外自旋极化。为了说明这一点，我们对各种拓扑绝缘体[Pb（Bi，Sb）_2Te_4，Bi_2Te_3，Bi_2Se_3和TlBiSe_2]的弯曲强度进行了定量分析，并阐明了平面外自旋极化P_z是系统相关的具有弯曲强度。但是，当翘曲很强时，发现P_z的大小仅为k·p理论所预期的一半。除了确认自旋极化和表面状态结构之间的通用关系外，我们的数据还提供了调整拓扑绝缘子中自旋极化的经验指导原则。

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  • 来源
    《Physical review》 |2014年第4期|045134.1-045134.6|共6页
  • 作者

    M. Nomura; S. Souma; A. Takayama; T. Sato; T. Takahashi; K. Eto; Kouji Segawa; Yoichi Ando;

  • 作者单位

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan,WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan;

    Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan;

    Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan;

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  • 关键词

    electron states at surfaces and interfaces; electron density of states and band structure of crystalline solids; photoemission and photoelectron spectra;

    机译：表面和界面的电子态;态固体的电子态密度和能带结构;光发射和光电子能谱;

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