Theory of Light-Induced Drift of Electrons in Coupled Quantum Wells
Abstract
A theory of the new effect of light-induced drift (LID) in coupled potential wells is developed on the basis of the density-matrix method. The effect appears when light excites intersubband electronic transitions. LID manifests itself as the photocurrent of the 2-d electron gas in the well plane, which depends on coherent electron tunneling between the coupled wells. The theory shows the effect to possess distinctive features such as a characteristic antisymmetric spectral contour consisting of four alternating positive and negative peaks and the change of sign of the LID current with the sign change of the bias normal to the quantum-well plane. The quantitative estimates for GaAs wells show the LID current to be readily detectable. COUPLED QUANTUM WELLS, DENSITY MATRIX, LIGHT-INDUCED DRIFT, INTERSUBBAND TRANSITIONS, ELECTRONS, PHOTOCURRENT IN WELL PLANE.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1992
- Accession Number
- ADA253609
Entities
People
- Leonid S. Muratov
- Mark I Stockman
- Thomas F. George
Organizations
- Washington State University