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Resonance peak shift in the photocurrent of ultrahigh-mobility two-dimensional electron systems

机译：超高迁移率二维电子系统光电流中的共振峰位移

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摘要

We report on a theoretical study on the rise of strong peaks at the harmonics of the cyclotron resonance in the irradiated magnetoresistance in ultraclean two-dimensional electron systems. The motivation is the experimental observation of a totally unexpected strong resistance peak showing up at the second harmonic. We extend the radiation-driven electron orbit model (previously developed to study photocurrent oscillations and zero resistance states) to an ultraclean scenario that implies a longer scattering time and longer mean free path. Thus, when the mean free path is equivalent, in terms of energy, to twice the cyclotron energy (2hw_c), the electron behaves as under an effective magnetic field that is twice the one actually applied. Then, at high radiation power and/or low temperature, a resistance spike can be observed at the second harmonic. For even cleaner samples the energy distance could increase to three or four times the cyclotron energy giving rise to resistance peaks at higher harmonics (third, fourth, etc.), i.e., a resonance peak shift to lower magnetic fields as the quality of the sample increases. Thus, by selecting the sample mobility, one automatically would select the radiation resonance response without altering the radiation frequency.
机译：我们报告了关于在超净二维电子系统中辐射磁阻中回旋共振谐振谐波处强峰上升的理论研究。动机是在二次谐波处出现一个完全出乎意料的强电阻峰的实验观察。我们将辐射驱动的电子轨道模型（以前用于研究光电流振荡和零电阻状态的模型）扩展到超净场景，这意味着更长的散射时间和更长的平均自由程。因此，当平均自由程在能量上等于回旋加速器能量的两倍（2hw_c）时，电子的行为就像在有效磁场的作用下一样，是实际施加磁场的两倍。然后，在高辐射功率和/或低温下，可以在二次谐波处观察到电阻尖峰。对于更清洁的样品，能量距离可能会增加到回旋加速器能量的三倍或四倍，从而在高次谐波（三次，三次等）下产生电阻峰，即随着样品的质量共振峰向更低的磁场移动增加。因此，通过选择样品迁移率，将自动选择辐射共振响应而不会改变辐射频率。

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  • 来源
    《Physical review》 |2020年第11期|115419.1-115419.5|共5页
  • 作者

    Jesús Iñarrea;

  • 作者单位

    Escuela Politécnica Superior Universidad Carlos Ⅲ Leganes Madrid 28911 Spain Unidad Asociada al Instituto de Ciencia de Materiales CSIC Cantoblanco Madrid 28049 Spain;

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