Abstract
We study the low-temperature magnetophotoluminescence from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting (ΔXY<0.5meV) exhibit a conventional left and right circularly polarized Zeeman photoluminescence doublet in applied magnetic fields. In contrast, nanocrystals with large ΔXY (>1meV) show an anomalous magnetophotoluminescence polarization, wherein the lower-energy peak becomes circularly polarized with increasing field, while the higher-energy peak remains linearly polarized. This unusual behavior arises from strong mixing between the absorbing and emitting bright exciton levels due to strong anisotropic exchange interactions.
Original language | English |
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Article number | 017402 |
Journal | Physical review letters |
Volume | 102 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 5 2009 |
ASJC Scopus subject areas
- Physics and Astronomy(all)