Abstract
The optical intersubband transitions and femtosecond dynamics of electrons in quantum well states in are investigated by interferometric time-resolved two-photon photoemission. The quantum well wave functions and transition probabilities are evaluated from the two-photon photoemission resonance energies and intensities using an extended phase accumulation model. Direct femtosecond pump-probe correlation measurements elucidate the importance of interfaces in confined structures.
- Received 25 October 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.116801
©2002 American Physical Society