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Low-temperature surface conduction in the Kondo insulator SmB_6

机译:近藤绝缘子SmB_6中的低温表面传导

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摘要

We study the transport properties of the Kondo insulator SmB_6 with a specialized configuration designed to distinguish bulk-dominated conduction from surface-dominated conduction. We find that as the material is cooled below 4 K, it exhibits a crossover from bulk to surface conduction with a fully insulating bulk. We take the robustness and magnitude of the surface conductivity, as is manifest in the literature of SmB_6, to be strong evidence for the topological insulator metallic surface states recently predicted for this material.
机译:我们用专门的结构研究了近藤绝缘子SmB_6的传输特性,该结构旨在区分体主导的传导与表面主导的传导。我们发现,当材料冷却到4 K以下时,它会呈现出从块状到表面传导的交叉,并具有完全绝缘的块状。正如SmB_6的文献所示,我们将表面电导率的强度和强度作为最近针对该材料预测的拓扑绝缘体金属表面状态的有力证据。

著录项

  • 来源
    《Physical review》 |2013年第18期|180405.1-180405.5|共5页
  • 作者单位

    Department of Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA;

    Department of Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA;

    Department of Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA;

    Department of Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA;

    Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697, USA;

    Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697, USA;

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

    strongly correlated electron systems; heavy fermions; electron states at surfaces and interfaces;

    机译:强相关电子系统;重费米子表面和界面的电子态;

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