Amplification and directional emission of surface acoustic waves by a two-dimensional electron gas
Amplification and directional emission of surface acoustic waves by a two-dimensional electron gas
复制标题
二维电子气表面声波的放大和定向发射
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
K. Pipe
中科院分区：
文献类型：
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作者：
Lei Shao;K. Pipe
对二维电子气(2DEG)中电子漂移对声表面波(SAW)的放大进行了理论分析和实验验证。计算表明，每声表面波弧度的峰值功率增益出现在2DEG比块状材料更实际的载流子密度下。研究还表明，在外加直流电场的情况下，通过调制二维电子气的载流子密度(以实现声表面波的产生)，可以实现具有可调谐方向性的声表面波发射，该场放大了沿特定方向传播的声表面波，而衰减了沿相反方向传播的声表面波。
Amplification of surface acoustic waves (SAWs) by electron drift in a two-dimensional electron gas (2DEG) is analyzed analytically and confirmed experimentally. Calculations suggest that peak power gain per SAW radian occurs at a more practical carrier density for a 2DEG than for a bulk material. It is also shown that SAW emission with tunable directionality can be achieved by modulating a 2DEG's carrier density (to effect SAW generation) in the presence of an applied DC field that amplifies SAWs propagating in a particular direction while attenuating those propagating in the opposite direction.