Abstract
We have measured the low-temperature (4.2 K) exciton lifetimes of zinc-blende CdTe nanocrystal quantum
dots (NQDs), 2.6–3.8 nm in diameter, in magnetic fields up to 30 T. The exciton photoluminescence decay time
decreases with both dot size and magnetic field. We explain the decrease in decay time in magnetic fields by the
mixing of bright and dark exciton states due to a small shape asymmetry in the zinc-blende CdTe NQDs. We
show that this behavior resembles that of wurtzite CdSe NQDs, and we demonstrate that an asymmetry of NQDs
caused by either shape or crystal structure leads to similar exciton decay dynamics.
Original language | English |
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Pages (from-to) | 035304/1-035304/5 |
Number of pages | 5 |
Journal | Physical review. B, Condensed matter and materials physics |
Volume | 83 |
DOIs | |
Publication status | Published - 2011 |