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Hot electron injection driven phase transitions

机译:热电子注入驱动的相变

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摘要

We report on a general mechanism for photo-induced phase transitions. The process relies on the photo-injection of hot electrons from an adjacent metallic layer to trigger the structural dynamics of the materials of interest. This mechanism is demonstrated for the semiconductor-to-metal phase transition of VO_2 using a 20 nm Au injection layer. The nature of the phase transition is demonstrated by time-resolved optical transmission measurements, as well as a well defined bias dependence that illustrates that the Au film is the source of nonequilibrium electrons driving the phase transition.
机译:我们报告了光致相变的一般机制。该过程依赖于来自相邻金属层的热电子的光注入来触发感兴趣材料的结构动力学。演示了使用20 nm Au注入层实现VO_2的半导体到金属相变的机理。通过时间分辨的光学透射率测量以及明确定义的偏置相关性证明了相变的性质,这说明了Au膜是驱动相变的非平衡电子源。

著录项

  • 来源
    《Physical review》 |2012年第13期|134101.1-134101.6|共6页
  • 作者单位

    Max Planck Research Department for Structural Dynamics, Center for Free Electron Laser Science, University of Hamburg, c/o DESY, Notkestrasse 85, Hamburg 22607, Germany;

    Max Planck Research Department for Structural Dynamics, Center for Free Electron Laser Science, University of Hamburg, c/o DESY, Notkestrasse 85, Hamburg 22607, Germany;

    Max Planck Research Department for Structural Dynamics, Center for Free Electron Laser Science, University of Hamburg, c/o DESY, Notkestrasse 85, Hamburg 22607, Germany;

    Max Planck Research Department for Structural Dynamics, Center for Free Electron Laser Science, University of Hamburg, c/o DESY, Notkestrasse 85, Hamburg 22607, Germany;

    Quantum Science and Engineering Center, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    Quantum Science and Engineering Center, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, Tennessee 37235, USA;

    Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, Tennessee 37235, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    electronic transport in interface structures; solid surfaces and solid-solid interfaces: structure and energetics;

    机译:接口结构中的电子传输;固体表面和固体-固体界面:结构和能量学;

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