skip to main content

Title: 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 while attenuating those propagating in the opposite direction.
Authors:
 [1] ;  [1] ;  [2]
  1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2125 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22399126
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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