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首页> 外文期刊>Physical review >Magnetophonon spectroscopy of Dirac fermion scattering by transverse and longitudinal acoustic phonons in graphene
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Magnetophonon spectroscopy of Dirac fermion scattering by transverse and longitudinal acoustic phonons in graphene

机译：石墨烯横向和纵声声子散射磁芯管光谱散射

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摘要

Recently observed magnetophonon resonances in the magnetoresistance of graphene are investigated using the Kubo formalism. This analysis provides a quantitative fit to the magnetophonon resonances over a wide range of carrier densities. It demonstrates the predominance of carrier scattering by low-energy transverse acoustic (TA) mode phonons: the magnetophonon resonance amplitude is significantly stronger for the TA modes than for the longitudinal acoustic (LA) modes. We demonstrate that the LA and TA phonon speeds and the electron-phonon coupling strengths determined from the magnetophonon resonance measurements also provide an excellent fit to the measured dependence of the resistivity at zero magnetic field over a temperature range of 4-150 K. A semiclassical description of magnetophonon resonance in graphene is shown to provide a simple physical explanation for the dependence of the magneto-oscillation period on carrier density. The correspondence between the quantum calculation and the semiclassical model is discussed.
机译：最近观察到在石墨烯的磁阻中的磁芯谐振进行了使用Kubo形式主义来研究。该分析提供了在广泛的载体密度范围内的磁芯谐振的定量拟合。它通过低能量横向声学（TA）模式声子来证明载波散射的优势：对于TA模式而言，磁芯谐振幅度比纵向声学（LA）模式明显更强。我们证明，从磁芯谐振测量确定的La和Ta声子速度和电子 - 声子耦合强度也在4-150k的温度范围内提供优异的符合电阻率的电阻率的依赖性。图石墨烯中的磁芯谐振的描述显示为磁振动周期对载流子密度的依赖性提供了简单的物理说明。讨论了量子计算与半导体模型之间的对应关系。

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  • 来源
    《Physical review》 |2019年第15期|155120.1-155120.8|共8页
  • 作者

    Greenaway M. T.; Kumar R. Krishna; Kumaravadivel P.; Geim A. K.; Eaves L.;

  • 作者单位

    Loughborough Univ Dept Phys Loughborough LE11 3TU Leics England|Univ Nottingham Sch Phys & Astron Nottingham NG7 2RD England;

    Univ Manchester Sch Phys & Astron Manchester M13 9PL Lancs England;

    Univ Manchester Sch Phys & Astron Manchester M13 9PL Lancs England|Univ Manchester Natl Graphene Inst Manchester M13 9PL Lancs England;

    Univ Manchester Sch Phys & Astron Manchester M13 9PL Lancs England|Univ Manchester Natl Graphene Inst Manchester M13 9PL Lancs England;

    Univ Nottingham Sch Phys & Astron Nottingham NG7 2RD England|Univ Manchester Sch Phys & Astron Manchester M13 9PL Lancs England;

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