ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We demonstrate that transient optical dephasing experiments on electrically biased, shallow multiple quantum wells offer the unique possibility of studying the first step in carrier sweep-out, namely, the tunneling escape out of the individual quantum wells. We find that the electron tunneling times out of the quasibound n=1 quantum well states into the continuum states lie in the subpicosecond regime at high electric fields. In addition, the experimentally determined escape rate is resonantly enhanced when the quasibound n=1 quantum well state couples with the resonant n=2 continuum state originating from the second-nearest neighbor well.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.110479