Anomalous circular polarization of magneto-photoluminescence from individual CdSe nanocrystals

Details Anomalous circular polarization of magneto-photoluminescence from individual CdSe nanocrystals Anomalous circular polarization of magneto-photoluminescence from individual CdSe nanocrystals

2008-09-05

arxiv.org/abs/0809.1116v1

Physical Review Letters 102, 017402 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 3 figures; submitted

Scientific paper

10.1103/PhysRevLett.102.017402

We study the low-temperature magneto-photoluminescence (PL) from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting ($<$0.5 meV) exhibit a conventional left- and right-circularly polarized Zeeman PL doublet in applied magnetic fields. In contrast, nanocrystals with large fine structure splitting ($>$1 meV) show an anomalous magneto-PL 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.

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