Photomodulation spectroscopy of narrow minibands in the continuum of multi quantum wells
Abstract
Photomodulation technique is utilized to spectroscopically resolve minibands structure in the energy "continuum" above the barriers of a InGaAs/InP multi quantum-well structure. Above-bandgap radiation is used to continuously pump electrons into the first electronic level, which is confined in each well. Infrared radiation is used to probe the optical transitions of these electrons to higher subband levels. The transition to the second electronic level, which is also confined, is observed together with higher order transitions to extended states. By comparison between the experimental observations to calculations based on the k· p model, we account for the energy, the lineshape and temperature dependence of the newly observed minibands.
- Publication:
-
Solid State Electronics
- Pub Date:
- June 1994
- DOI:
- 10.1016/0038-1101(94)90405-7
- Bibcode:
- 1994SSEle..37.1269O