Abstract
Recent experiments on asymmetric double-quantum-well systems revealed unexpected long time scales of resonant tunnel processes as well as deviations from the expected dependence of the tunneling lifetime T on the barrier thickness. Both effects are related to the presence of dissipative processes. Starting from microscopic expressions for T beyond the usual golden rule approach we show that the observed behavior is a consequence of Fano interference, which implies that low-temperature dissipative tunneling can be treated as a totally coherent process. Including disorder due to interface roughness, these Fano interferences lead to a nonexponential and slowed-down decay. © 1996 The American Physical Society.
- Received 31 January 1996
DOI:https://doi.org/10.1103/PhysRevB.53.16531
©1996 American Physical Society