Picosecond time-resolved cyclotron resonance study of InSb quantum wells in a quantizing magnetic field

Proceedings. IEEE Lester Eastman Conference on High Performance Devices Pub Date : 1900-01-01 DOI:10.1109/LECHPD.2002.1146755

D.C. Larrabee, G. Khodaparast, I. Kôno, D. S. King, S.J. Chune, M.B. Santos

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Abstract

Using two-color pump-probe spectroscopy in a magnetic field, we have measured the time-resolved cyclotron resonance of photogenerated transient carriers in undoped and doped InSb quantum wells. We used an intense femtosecond pulse of near-infrared (NIR) radiation from a Ti:sapphire-based regenerative amplifier to create a large density of nonequilibrium carriers, which modifies the transmission of a delayed pulse of far-infrared (FIR) radiation from a free-electron laser. We monitored the dynamics of FIR transmission while varying the magnetic field and the time delay between the NIR and FIR pulses. Our data clearly show that the average electron cyclotron mass decreases as the electrons relax towards the band edge, as expected from the strong nonparabolicity of the InSb conduction band. Detailed lineshape analysis combined with Landau level calculations allowed us to determine the time evolution of the Fermi-Dirac distribution function of nonequilibrium. two-dimensional carriers in a quantizing magnetic field.

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量子化磁场中InSb量子阱的皮秒时间分辨回旋共振研究

利用磁场中的双色泵浦-探针光谱，我们测量了未掺杂和掺杂InSb量子阱中光生瞬态载流子的时间分辨回旋共振。我们使用来自Ti:蓝宝石基再生放大器的强飞秒近红外(NIR)辐射脉冲来产生大密度的非平衡载流子，这改变了来自自由电子激光器的延迟远红外(FIR)辐射脉冲的传输。我们通过改变磁场和近红外脉冲与FIR脉冲之间的时间延迟来监测FIR传输的动态。我们的数据清楚地表明，随着电子向带边缘放松，电子回旋加速器的平均质量降低，这与InSb导带的强非抛物线性所期望的一致。详细的线形分析结合朗道能级计算使我们能够确定非平衡态费米-狄拉克分布函数的时间演化。量子化磁场中的二维载流子。

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Proceedings. IEEE Lester Eastman Conference on High Performance Devices

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