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首页> 外文期刊>Physical review >Tunable spin current due to bulk insulating property in the topological insulator Tl_(1-x)Bi_(1+x)Se_(2-δ)
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Tunable spin current due to bulk insulating property in the topological insulator Tl_(1-x)Bi_(1+x)Se_(2-δ)

机译:由于拓扑绝缘体Tl_(1-x)Bi_(1 + x)Se_(2-δ)中的体绝缘特性而产生的自旋电流可调

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摘要

The surfaces of three-dimensional topological insulators characterized by spin-helical Dirac fermions provide a fertile ground for realizing exotic phenomena, and they have the potential for wide-ranging applications. To realize most of their special properties, the Dirac point must be located near the Fermi energy with a bulk insulating property. However, this is barely achieved in most of the discovered topological insulators. It was found recently that TlBiSe_2 features an in-gap Dirac point, where the upper and lower parts of the Dirac-cone surface state are both utilized. Nevertheless, investigations of the surface transport properties of this material are limited due to the lack of bulk insulating characteristics. Here, we present a realization of the bulk insulating property by tuning the composition of Tl_(1-x)Bi_(1+x)Se_(2-δ) without introducing guest atoms. This result promises to shed light on exotic topological phenomena on the surface.
机译:以自旋螺旋狄拉克费米子为特征的三维拓扑绝缘体的表面为实现奇异现象提供了沃土,并且具有广泛的应用潜力。为了实现它们的大多数特殊性能,狄拉克点必须位于具有大量绝缘特性的费米能量附近。但是,这在大多数发现的拓扑绝缘子中几乎无法实现。最近发现,TlBiSe_2具有间隙内狄拉克点,其中利用了狄拉克锥表面状态的上部和下部。然而,由于缺乏整体绝缘特性,对该材料的表面传输性能的研究受到限制。在这里,我们介绍了通过调整Tl_(1-x)Bi_(1 + x)Se_(2-δ)的组成而不引入来宾原子来实现体绝缘性能的方法。该结果有望阐明表面上的奇异拓扑现象。

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  • 来源
    《Physical review》 |2015年第20期|205306.1-205306.7|共7页
  • 作者单位

    Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan;

    Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan;

    Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan;

    Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan,Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Kure National College of Technology, Agaminami 2-2-11, Kure 737-8506, Japan;

    Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan;

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  • 正文语种 eng
  • 中图分类
  • 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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