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首页> 外文期刊>Physical review letters >Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi_2Se_3
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Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi_2Se_3

机译：拓扑绝缘体Bi_2Se_3中持久性表面态种群的超快光激发。

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摘要

Using femtosecond time- and angle-resolved photoemission spectroscopy, we investigated the non-equilibrium dynamics of the topological insulator Bi_2Se_3. We studied p-type Bi_2Se_3, in which the metallic Dirac surface state and bulk conduction bands are unoccupied. Optical excitation leads to a metastable population at the bulk conduction band edge, which feeds a nonequilibrium population of the surface state persisting for >10 ps. This unusually long-lived population of a metallic Dirac surface state with spin texture may present a channel in which to drive transient spin-polarized currents.
机译：使用飞秒时间和角度分辨光发射光谱，我们研究了拓扑绝缘体Bi_2Se_3的非平衡动力学。我们研究了p型Bi_2Se_3，其中不存在金属狄拉克表面态和体导带。光学激发导致在整体导带边缘出现亚稳态种群，从而为表面态的非平衡种群提供了持续时间大于10 ps的能量。具有自旋纹理的金属狄拉克表面状态的这种异常长寿命的种群可能会提供驱动瞬态自旋极化电流的通道。

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  • 来源
    《Physical review letters》 |2012年第11期|p.117403.1-117403.5|共5页
  • 作者

    J. A. Sobota; S. Yang; J.G. Analytis; Y.L. Chen; I.R. Fisher; P.S. Kirchmann; Z.-X. Shen;

  • 作者单位

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA,Department of Physics, Stanford University, Stanford, California 94305, USA;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA,Department of Physics, Stanford University, Stanford, California 94305, USA;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA,Department of Physics, Stanford University, Stanford, California 94305, USA;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Fritz Haber Institute of the Max Planck Society, Department of Physical Chemistry, Faradayweg 4-6, D-14195 Berlin, Germany;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, Menlo Park, California 94025, USA,Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA,Department of Physics, Stanford University, Stanford, California 94305, USA;

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  • 关键词

    optical creation of spin polarized carriers; electron states at surfaces and interfaces; photoemission and photoelectron spectra;

    机译：自旋极化载体的光学产生;表面和界面的电子态;光发射和光电子能谱;

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