Journal
PHYSICAL REVIEW B
Volume 65, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.65.045319
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We study hole intraband relaxation in strongly confined CdSe quantum dots. We observe a dramatic reduction in the hole energy-loss rate in the final stage of hole relaxation at the bottom of the valence band. This reduction occurs because of a significantly increased inter-level spacing near the band edge, and, in particular, because of a large energy gap separating the lowest (emitting) hole states from a dense quasi-continuum of higher lying states. A slowed population buildup of the lowest hole state indicates that the phonon bottleneck, which is bypassed in the conduction band due to Auger-type electron-hole interactions, still plays a significant role in hole relaxation.
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