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Impulsive excitation of cyclotron oscillations in a two-dimensional electron gas

机译:二维电子气中回旋加速器振荡的脉冲激发

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We report on the impulsive excitation and control of intersubband and hybrid intersubband-cyclotron modes in a two-dimensional electron gas by ultrafast optical pulses. Pump-probe experiments were performed in the reflection geometry on a modulation-doped GaAs/AlxGa1-xAs quantum well at 7 K. Using a pulse shaper to produce multiple excitation pulses, we demonstrate coherent control of charge-density intersubband modes. When a tilted magnetic field is applied, we observe oscillations due to hybrid intersubband-cyclotron modes. The features observed in the pump-probe experiments are consistent in frequency and selection rules with spontaneous Raman scattering data obtained from the same sample. (C) 2005 Elsevier Ltd. All rights reserved.
机译:我们报告了超快光脉冲对二维电子气中子带间和混合子带间回旋加速器模式的脉冲激励和控制。在7 K的调制掺杂GaAs / AlxGa1-xAs量子阱上以反射几何形状进行泵浦探针实验。使用脉冲整形器产生多个激励脉冲,我们证明了电荷密度子带间模式的相干控制。当施加倾斜磁场时,我们观察到由于混合子带回旋加速器模式而引起的振荡。在泵浦探针实验中观察到的特征在频率和选择规则上与从同一样品获得的自发拉曼散射数据一致。 (C)2005 Elsevier Ltd.保留所有权利。

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