Impact of Fano Resonances on the Wannier-Stark Ladder
Abstract
We report on the observation of Fano resonances in electrically biased superlattices. In such structures. Coulomb interaction couples discrete exciton states to continua of lower lying subbands. We thus observe Fano resonances on the Wannier-Stark states. In superlattices, it is possible to continuously tune the coupling strength by sweeping the electric field. We prove this by linear absorption spectroscopy which demonstrates that the coupling and the line asymmetry change with field. We also measured the polarization decay of the Wannier-Stark transitions and found a decrease of the dephasing times for growing Fano coupling strength.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 18, 1999
- Accession Number
- ADP012941
Entities
People
- D. M. Whittaker
- F. Loeser
- M. Sudziust
- P. Holfeld
- T. W. Canzler