THz photoconductivity resonances with plasmon modes in double quantum well field effect transistors
Abstract
Double quantum well field-effect transistors with a grating gate exhibit resonant, voltage tuned terahertz photoconductivity. While the detection mechanism is not yet clear, we have confirmed that the resonant frequency is determined by the 2-dimensional magneto-plasma oscillations of the composite structure and is related to the spatially modulated electron densities of the wells, the period of the grating, and the strength of an in-plane magnetic field. These results suggest that one could develop a fast, voltage tunable terahertz detector based on two dimensional plasma oscillations of coupled double quantum wells. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under Contract DE-AC04-94AL85000. Also supported by ARO, DARPA and ONR-MFEL.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MAR.G8007W