论文标题
超高驱动性二维电子系统的谐振峰值变化
Resonance peak shift in the photo-current of ultrahigh-mobility two-dimensional electron systems
论文作者
论文摘要
我们报告了一项关于在超级二维电子系统中辐射磁化磁性中的谐波谐波谐波谐波谐波谐波谐波谐波中强峰值上升的理论研究。动机是对第二个谐波出现的完全出乎意料的强阻力峰的实验观察。我们将辐射驱动的电子轨道模型（以前开发用于研究光电流振荡和零电阻状态）到超干净的场景，这意味着更长的散射时间和更长的均值自由路径。因此，当平均自由路径在能量方面相当于回旋器能量的两倍（$ 2 \ hbar w_ {c} $）时，电子在有效的磁场下的表现是真正应用的两倍。然后，在高辐射功率和/或低温下，可以在第二个谐波}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通能量的三到四倍，从而在较高的谐波（第三，第四，第四等）中引起电阻峰，即，随着样品质量的增加，共振峰向较低的磁场转移。因此，通过选择样品迁移率，一个人会自动选择辐射谐振响应而不会改变辐射频率。
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 a ultraclean scenario that implies 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 ($2\hbar w_{c}$), the electron behaves as under an effective magnetic field twice the one really applied. Then, at high radiation power and/or low temperature, a resistance spike can be observed {\it 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.
