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Pronounced electron-phonon interactions in ultraclean suspended carbon nanotubes

机译:超净悬浮碳纳米管中明显的电子-声子相互作用

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摘要

We report pronounced electron-phonon interactions m suspended, nearly defect-free metallic carbon nanotubes, observed through a Kohn anomaly (KA) of greater strength than theoretically predicted. This KA is accompanied by a gate-induced modulation of the G_ band Raman intensity. By establishing a quantitative correlation between the strength of the nonadiabatic KA and the modulation of Raman intensity, we determine that the underlying cause that leads to both these effects is the same. By varying temperature, we find that metallic nanotubes can switch between a regime in which the nonadiabatic KA is clearly observed and a regime where the nonadiabatic KA is absent. The regime that does not exhibit a nonadiabatic KA is accompanied by a suppression of the Raman intensity under electrostatic gating, whereas in the regime where the nonadiabatic KA is clearly observed, strong enhancement of the Raman intensity with gating is observed.
机译:我们报告通过悬空的,几乎没有缺陷的金属碳纳米管发出的明显的电子声子相互作用,这是通过比理论上更大的强度的Kohn异常(KA)观察到的。该KA伴随着栅极感应的G_带拉曼强度的调制。通过建立非绝热KA的强度和拉曼强度的调制之间的定量相关性,我们确定导致这两种影响的根本原因是相同的。通过改变温度,我们发现金属纳米管可以在清楚观察到非绝热KA的状态和不存在非绝热KA的状态之间切换。不表现出非绝热KA的状态伴随着静电门控下拉曼强度的抑制,而在清楚观察到非绝热KA的状态下,观察到了随着门控拉曼强度的强烈增强。

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  • 来源
    《Physical review》 |2012年第4期|p.045427.1-045427.6|共6页
  • 作者单位

    Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA;

    Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, USA;

    Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, USA;

    Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, USA;

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

    nanotubes; collective excitations (including excitons, polarons, plasmons and other charge-density excitations); nanotubes;

    机译:纳米管集体激发(包括激子;极化子;等离激元和其他电荷密度激发);纳米管;

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