Amplification and directional emission of surface acoustic waves by a two-dimensional electron gas
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 …
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 …
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