Subband separation energy dependence of intersubband relaxation time in wide quantum wells
- 3 March 1997
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 70 (9) , 1155-1157
- https://doi.org/10.1063/1.118511
Abstract
Subband separation energy dependence of intersubband relaxation time in a wide quantum well (250 Å) was studied by steady-state and time-resolved photoluminescence. By applying a perpendicular electrical field, the subband separation energy in the quantum well is continuously tuned from 21 to 40 meV. As a result, it is found that the intersubband relaxation time undergoes a drastic change from several hundred picoseconds to subpicoseconds. It is also found that the intersubband relaxation has already become very fast before the energy separation really reaches one optical phonon energy.Keywords
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