Abstract
The response of a biased double-barrier quantum well to a small ac voltage with characteristic time and the transit or dwell time are calculated using nonequilibrium Green’s-function techniques. The tunneling process is shown to be predominantly sequential for an As/As structure due to only well alloy scattering treated in the coherent-potential approximation. The magnitudes of and are in close agreement and about the same for either sequential or coherent tunneling.
- Received 7 January 1992
DOI:https://doi.org/10.1103/PhysRevB.45.9145
©1992 American Physical Society