论文标题
超快应变诱导的半导体超晶格中的电荷转运
Ultrafast strain-induced charge transport in semiconductor superlattices
论文作者
论文摘要
我们研究了在半导体超晶格中高超音速（> 1 GHz）声音子波袋对电子传输的影响。我们的量子机械模拟表明，通过超晶格传播的Picsecond变形应变脉冲的GHz火车可以产生电流振荡，其频率比应变脉冲序列高几倍。计算出的电流脉冲的形状和极性与实验测量的电信号非常吻合。计算还可以解释并准确地重现了诱导电流脉冲幅度的测得的变化，并用应变脉冲振幅和施加的偏置电压变化。我们的结果为开发出听力驱动的半导体超晶格的途径是毫米和亚毫米电磁波的来源。
We investigate the effect of hypersonic (> 1 GHz) acoustic phonon wavepackets on electron transport in a semiconductor superlattice. Our quantum mechanical simulations demonstrate that a GHz train of picosecond deformation strain pulses propagating through a superlattice can generate current oscillations whose frequency is several times higher than that of the strain pulse train. The shape and polarity of the calculated current pulses agree well with experimentally measured electric signals. The calculations also explain and accurately reproduce the measured variation of the induced current pulse magnitude with the strain pulse amplitude and applied bias voltage. Our results open a route to developing acoustically-driven semiconductor superlattices as sources of millimetre and sub-millimetre electromagnetic waves.
