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

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4905836· OSTI ID:22399126

Shao, Lei ^[1]

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1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2125 (United States)

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.

• OSTI ID: 22399126
• Journal Information: Applied Physics Letters, Vol. 106, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARRIER DENSITY
CHARGE CARRIERS
ELECTRON DRIFT
ELECTRON GAS
EMISSION
GAIN
SOUND WAVES
SURFACES
TWO-DIMENSIONAL SYSTEMS
WAVE PROPAGATION